Malicious PDF — malware analysis report

Static analysis result for SHA-256 74422539c72aa5ed…

MALICIOUS

PDF

64.7 KB Created: 2020-11-10 11:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b56b5f79ebea5c3feda48a3b4d7b2736 SHA-1: 9cf164392ea2ed62760d2f46d8fc088e79b352ea SHA-256: 74422539c72aa5ed7264de7ff0af4429f25943f8f03bdb4dd7ebff254ee096a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?keyword=athens+city+schools+athens+tn+kid+connection PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5fa8721a03999.pdfIn PDF document text
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/a7f4da2789f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_5fa4558aac23b.pdfIn PDF document text
    • https://lusekovipe.weebly.com/uploads/1/3/4/2/134234723/8893161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5f8f276450ce3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34459ecc-9990-446b-82c6-ed2845a41d6d/76737154125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d63411-4a49-4e62-b3a7-8ba15e68b060/miluxiwexip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5474e656-7465-4fcc-9f21-370893a358e2/vanewijuki.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/bot_arena_2_hacked_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51ce166-9186-4368-84e9-1344181f2d50/femefovela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f04d5f-5ecd-471e-89c3-002e61bf3922/kajaxejukesalukaladufuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536f460c-87d4-4135-a00d-6021ec0217af/evermore_piano_sheet_music_dan_steve.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/mastering_blockchain_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160466a9-7806-41ed-98ef-530ec4360f77/vajazatokewut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adeaf7d8-7af5-437b-80b0-b343e01f37a3/81368427573.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B4 5088 bytes
SHA-256: 7b6d211b6ddbc7d9d40378187d710823ef24b3687e7f991eb1679bc88e7918b7
font_01_sfnt_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 10492 bytes
SHA-256: 2b55cf27f5c6712435aa4c175dba39d71b07baacb70b7492112dcf6adf937653

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