Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ded9e05e9afc5a…

MALICIOUS

PDF

70.8 KB Created: 2021-03-28 16:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bbf5da91e63070e13a0dafb587e324f3 SHA-1: 859e6177b1b7050f5ee1c9152650a9927cbef8a1 SHA-256: a0ded9e05e9afc5a4af0cad9a8cb9df3ad348340f8a462f7664daecac8d08fc5
186 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 0.9997

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://jumiwimov.ru/123?utm_term=unduh+uc+browser+apk+versi+lama PDF link annotation
    • https://cdn.sqhk.co/pifizumux/oZaFRgh/jabixoxafala.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/4geYzvD/kofokixatuzawij.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/hbgjZDG/vonobonazotuja.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/chcjdfd/movie_night_snacks_to_make.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_602c443c32631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fe029f2aad3f.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/ce6a280f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5ff0abd4a6048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_60564f8ab5e16.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/1311790.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/kosin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_600f5476b559f.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/5f21e97a-5a01-4e85-82ba-ca61e9b9be3c/33971011772.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/74539044543.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/6690365908.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/75383289535.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/free_converter_to_word_docx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b1b8c4-7357-47db-9208-9897e1b79886/rebatorixaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7a8261-7e1a-437e-b5a4-3a4e0e4f5f85/what_do_different_tattoo_symbols_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/citroen_c3_2004_manual_greek.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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 5660 bytes
SHA-256: 0c765711a9e4fe8ea19dcefdb18eb361c261e8c7d98f2a689de671e154021250
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 13136 bytes
SHA-256: a14cb1c9a4a742b3b5190c6dee29fb75f0ac2bfdc0d140d2b2906a1a44bc5b00

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