Malicious PDF — malware analysis report

Static analysis result for SHA-256 614b4f813b7a0bbe…

MALICIOUS

PDF

67.0 KB Created: 2020-11-24 05:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: db7b3c598a5c02027997dba4dee87832 SHA-1: 374daf9e840c6919f0dcfc28147244913359894a SHA-256: 614b4f813b7a0bbe6ce1a128c71d338cb3982e302fb2e808c53bdf64476925ce
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these external URLs, which is a common tactic for distributing further malicious content or leading users to phishing pages.

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://trafftec.ru/aws?utm_term=love+quotes+images PDF link annotation
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/tujavajex-zuxibiro-majuporojivu.pdfIn PDF document text
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/jisavegotifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fa101a4c61a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_5f97deb1543e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_5fa1476fc5c4f.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/3432683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f88136537e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f9cc282ebad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_5fa8861eaecf8.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/3af0492767d6.pdfIn PDF document text
    • https://ponutafozo.weebly.com/uploads/1/3/4/7/134705240/1198106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87072dcf87c.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/d5be8171-4ef6-4e06-b702-05ef00cc959c/xetezinaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a471fa-c126-401e-bf8f-a4aeb74836d7/bikogexubozaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4000a14-b5bd-4ec2-8e36-616736b623a9/introduction_to_geospatial_technologies_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/drawdown_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/984de860-9f99-420f-b174-a50a1e9f412e/agtalk_making_your_own_tracking_device.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_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 5004 bytes
SHA-256: 652b47acc9b7297738ad1f4046d84cf42aef1a55aed7d186c5aa33b8e1a80c89
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 10036 bytes
SHA-256: 9e5b191f243135384a4a68cdddc1ef1d9f9655383330fa5d92d6b2a0cf604fb2

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