Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fcfff70604e220…

MALICIOUS

PDF

377.2 KB Created: 2021-04-05 17:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 408418d6d4112c06ac41bb696b9a6071 SHA-1: b3969ba864f971744bbf8d74265f8dd531870c77 SHA-256: a3fcfff70604e2205eccc359f5d4a0abece49e30b036cb690ef5e7697214a119
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of a high-severity heuristic for a redirector link, specifically 'https://kuzutuzo.ru/wix?keyword=play.mob.org+apk+editor+pro', suggests a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references that align with the 'play.mob.org apk editor pro' theme, reinforcing the lure. The primary attack pattern observed is a phishing attempt disguised as a software download offer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8133

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/wix?keyword=play.mob.org+apk+editor+pro PDF link annotation
    • http://kesuvajeb.scienceontheweb.net/where_is_the_lint_trap_on_a_front_load_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/synonyms_and_antonyms_words.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/the_entertainer_sheet_music_easy_with_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_603e81ac67229.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/haljjcS/lowuzas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fd381669874e.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/classroom_language_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_6014378eaacb9.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/branca_de_neve_e_o_caador_livro.pdfIn PDF document text
    • http://momarivido.mypressonline.com/robin_hood_disney_prince_john_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601f047b5c7fc.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/aieijbv/download_python_code_editor_for_windows.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/31048377972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_606862439f9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6043f9e34a45a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_60191f8e64902.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamelaluwer.myartsonline.com/5643281417.pdfIn PDF document text
    • http://pidusagi.atwebpages.com/zoketijemamadaw.pdfIn PDF document text
    • http://jupevesu.atwebpages.com/zaxanoke.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0004eefc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EEFC 26824 bytes
SHA-256: b9e37f391bed3811c26bc3bab2e24f30ec4cdfe703819763f4ef6baab971d4c4
font_00_sfnt_off0004dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DC89 5440 bytes
SHA-256: 3048ddc645b31053bf3c0087754ea3531a824eca0c90166044cdc60e76f7870f
font_02_sfnt_off00052136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52136 57332 bytes
SHA-256: a8b668718b015e794aedc9f81f361195ff72d2101d3d91915277ab1b922105d8
font_03_sfnt_off000588d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x588D0 13044 bytes
SHA-256: 97e6d46a7bd76aa84478748abe6a9cfee93cc1aaece4b7b42b920c6bfba59954
font_04_sfnt_off0005b2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2ED 16336 bytes
SHA-256: 2c8dd6c7a28a84918c13eff9c382bc01327f684d9001f6dca27e14c0f656ec2d
font_05_sfnt_off0005c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C901 2572 bytes
SHA-256: ddc09560e4c96f9c8cfc12629ca2515bfbace636dd8c8e180588154d88f308b7

Open this report in the interactive analyzer, or submit your own file for analysis.