Malicious PDF — malware analysis report

Static analysis result for SHA-256 51acc3d0f78dfaa7…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 17:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3505656dd0bd95b89c060de1a415aa73 SHA-1: 54b4652969f925e7dfae3991ab9d31a88f044ef4 SHA-256: 51acc3d0f78dfaa7c901ae5a87cdbf9fb02d056a5418cb6e9eac3956d151ffe2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9999

Heuristics 5

  • 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://mezovuduw.ru/aws?utm_term=average+salary+of+data+scientist+in+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368505/normal_6054d46ea8d74.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/nurobidubibejem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_603363a368956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_5fe9da9fd53fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5ffb90794b092.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/fopuwijewitax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd61182cca61.pdfIn PDF document text
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/tinul-gokawazovixoku-wipinamit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_60160028b3cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_60502d80ba84e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368736/normal_600976d00966e.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/9318245.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/xadapopixug.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/65325536426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_6003b46594cb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_9d8307b0827649c98ce9e7a273849c44.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_4969d751ea3d4f62aee87d5140c17eb1.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_d4348fb5099d4fdcbbaaac8b1f0439cd.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5340 bytes
SHA-256: 912e0ab71af8026c4c95396ce7fd49b806541c797fc90ec08586bf57eccb4309
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 10992 bytes
SHA-256: 0cc359f559fe89dbe6554eefb42c0bd8005b47cdb73ee69ca70c5129db2412df

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