Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c325442af7b14fc…

MALICIOUS

PDF

73.7 KB Created: 2021-03-24 00:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 84a627a88083a81f297e2a65b084f25b SHA-1: cfa08163b5e6d4b93f08f752bb118971677d4407 SHA-256: 8c325442af7b14fc0c7badca497a44d30c1a9420ce9598a0105cc0e94fd96d9b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'. The embedded links likely serve as the initial lure to a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://leonvi.ru/123?utm_term=functions+in+open+office+spreadsheet PDF link annotation
    • https://cdn.sqhk.co/duwenaxiseve/flq9ZRf/android_change_lock_screen_password.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/iiKEgji/charli_d_amelio_wallpaper_aesthetic.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/jejjgju/v_live_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/geiaFid/50361834761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5fd77aaa6a86b.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/1ahEgjf/contract_killer_zombies_2_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/iefM6Ew/alchemy_forge_of_gods_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_60238e1c58b4e.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/gdtjiez/36196048610.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/wVAfjgi/dynamons_2_by_kizi_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/ghqHjaj/detifozenetutifefolid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/kesilajivubagukisafaveka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2c0496-0ed9-475c-b0d3-f4cedd7d4ad8/89346965973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd9497f-a358-43ff-a63a-d5b07aa2acad/what_are_the_seven_habits_of_highly_effective_thinkers_in_order.pdfIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_8de7cb7a13ea4d4da694c384eb415720.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/wakonezebokopu.pdfIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_abcb3ab9922d462aaf688ae4422d0803.pdf?index=trueIn 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 5168 bytes
SHA-256: 3284939e2b28e36389dfd489eb31ab5798850c4364a35450f6fff15a1f58f017
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10348 bytes
SHA-256: c06e47d6b20c44ea624d083869ce0323a0457c76cf5766957c7e8512f11f047e

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