Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecff14970d273cae…

MALICIOUS

PDF

80.8 KB Created: 2021-05-20 11:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 071b60a6be76088e55c3efb712a4e6e5 SHA-1: dc66bac2eef803552341b7571c098f699a2e78a9 SHA-256: ecff14970d273cae985dffb6ef6f754584141aa35230941dbaedc7f837a94439
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, a common tactic for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to diet and weight loss.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/strik?utm_term=dietas+para+bajar+la+panza+y+cintura+en+una+semana
    • https://cdn-cms.f-static.net/uploads/4424662/normal_6045fdc089a0f.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_6014b4bb88f77.pdf
    • https://ziripovamenof.weebly.com/uploads/1/3/4/6/134647136/vewadowogikaf.pdf
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/d8867d046e.pdf
    • https://gozataxuwo.weebly.com/uploads/1/3/0/7/130740141/wiwevojanipo-dizunefonulavi.pdf
    • https://pujofolowax.weebly.com/uploads/1/3/4/6/134669504/7425508.pdf
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/kupesu.pdf
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fc5f7bc4d3df.pdf
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/7532256.pdf
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/4107700.pdf
    • https://cdn-cms.f-static.net/uploads/4379618/normal_604d74adeaebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b188355-3fad-43ec-a540-7d6591d82c5b/how_to_pair_bluetooth_remote_to_firestick.pdf
    • https://s3.amazonaws.com/winumigutam/kuxavoku.pdf
    • https://uploads.strikinglycdn.com/files/388cf743-42b9-49eb-aaaf-fc6ab7e88dd9/living_room_book_cover.pdf
    • https://s3.amazonaws.com/bifamomove/bangla_movie_sathi_free.pdf
    • https://uploads.strikinglycdn.com/files/ffbe72e7-d229-4924-8110-913f389309aa/how_to_trade_forex_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/37b313a5-0bad-4501-ba4b-5d19f1a8e37c/safety_1st_hd_wifi_baby_monitor_with_audio_parent_unit.pdf
    • https://s3.amazonaws.com/zidosozawok/pexuxowatuwavafekowasobu.pdf
    • https://uploads.strikinglycdn.com/files/7ca8b83a-6314-48ba-a69b-c758787ed04a/29182610854.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb53.bin
8543fcaac88d1ecf9e8c6e367e1fc9679c3f3487023c39351f6db9d8db848792		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 5444 bytes
font_01_sfnt_off00010dde.bin
da31cf988c57330e9e73cc0e8c09af6509faaef6f8fbe8f447187c921f481585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 11688 bytes

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