Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e67b64f625dd253…

MALICIOUS

PDF

79.3 KB Created: 2021-01-05 04:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0fe15d0fea4caae8c68a9fe036d1f9d1 SHA-1: 922fb86644e14106b2358cc52ba0a852208e5689 SHA-256: 5e67b64f625dd253fdab0244ee62907056f06ee46f14175039be2900f9181dfd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/aws?utm_term=fitbit+charge+hr+user+manual+pdf PDF link annotation
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/bisuvov-xafal-woposolunededad-liful.pdfIn PDF document text
    • https://disemiseses.weebly.com/uploads/1/3/1/4/131407045/6279236.pdfIn PDF document text
    • https://mizanupiw.weebly.com/uploads/1/3/4/2/134265802/badinovanafuvuxixo.pdfIn PDF document text
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/2975731.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/6549382.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/4422922.pdfIn PDF document text
    • https://torejijifixoni.weebly.com/uploads/1/3/5/3/135335296/5417492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vonutavekip/assemblies_of_god_fundamental_truths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d9c78f-fd05-416b-9b3a-e9f155dc9bc9/gujinazimizevofisovu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/80362281698.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/the_fundamentals_of_drawing_portraits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e5ab39-0db0-4388-8572-bd91f936dfff/tororodoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b630b94f-3e39-473d-a1dc-4fadfd65edf1/juegos_de_jeff_the_killer_paisdelosjuegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a02f19-58ad-4675-9e3c-3130e74dffbf/35549973830.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 5436 bytes
SHA-256: d418d6cd50b696fc68fe8ea3ae4dbf8d3a4242b4abe40a1267d7e8dad70ca9b3
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10604 bytes
SHA-256: 88e8796710e6a7a6d5980359506508b300a55cc97a430b7caab99e228a6d55d4
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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