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)
MD5: 408418d6d4112c06ac41bb696b9a6071 SHA-1: b3969ba864f971744bbf8d74265f8dd531870c77 SHA-256: a3fcfff70604e2205eccc359f5d4a0abece49e30b036cb690ef5e7697214a119
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It uses lures related to advance-fee scams and callback phishing, suggesting a social engineering approach. The embedded URL points to a domain that appears to host a tool for editing APK files, indicating a potential attempt to trick users into downloading and executing further malicious content.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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) 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
    • http://kesuvajeb.scienceontheweb.net/where_is_the_lint_trap_on_a_front_load_dryer.pdf
    • https://cdn-cms.f-static.net/uploads/4426687/normal_603e81ac67229.pdf
    • https://cdn.sqhk.co/wolebiduju/haljjcS/lowuzas.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fd381669874e.pdf
    • http://bexukavinawexov.mygamesonline.org/classroom_language_in_english.pdf
    • https://cdn-cms.f-static.net/uploads/4467975/normal_6014378eaacb9.pdf
    • http://wudebakafepi.mypressonline.com/branca_de_neve_e_o_caador_livro.pdf
    • http://momarivido.mypressonline.com/robin_hood_disney_prince_john_plan.pdf
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601f047b5c7fc.pdf
    • https://cdn.sqhk.co/pifajaloro/aieijbv/download_python_code_editor_for_windows.pdf
    • http://buwovavozu.getenjoyment.net/31048377972.pdf
    • https://cdn-cms.f-static.net/uploads/4427544/normal_606862439f9a8.pdf
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6043f9e34a45a.pdf
    • https://cdn-cms.f-static.net/uploads/4496216/normal_60191f8e64902.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gamelaluwer.myartsonline.com/5643281417.pdf
    • http://pidusagi.atwebpages.com/zoketijemamadaw.pdf
    • https://s3.amazonaws.com/xidazeze/synonyms_and_antonyms_words.pdf
    • https://s3.amazonaws.com/redegelesibif/the_entertainer_sheet_music_easy_with_letters.pdf
    • http://jupevesu.atwebpages.com/zaxanoke.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

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

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