Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70d46ae43b13439…

MALICIOUS

PDF

74.6 KB Created: 2021-03-08 18:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fd71bd7f240e33058eda8aab0a0fd320 SHA-1: 5b03c47f54bdde34f98e33956fe6a16c663cd582 SHA-256: c70d46ae43b1343995bd751492e287596354fa06716ae64e129d95c946619232
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 0.9998

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://pelibifir.ru/123?utm_term=improve+my+handwriting+worksheets+pdf PDF link annotation
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/cd8817249b194ce.pdfIn PDF document text
    • http://draiwenstore.online/747706354739hljp.pdfIn PDF document text
    • https://bokakuvuzojoji.weebly.com/uploads/1/3/4/3/134351808/3567337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453129/normal_5fe438ac5d002.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/6958703.pdfIn PDF document text
    • https://tuluseso.weebly.com/uploads/1/3/4/7/134718642/942b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_601bc39bdf054.pdfIn PDF document text
    • https://darenufu.weebly.com/uploads/1/3/1/4/131438483/nerazuzapet.pdfIn PDF document text
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/visamuzosaj.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/4213279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_603d2906d2b2a.pdfIn PDF document text
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/rajuza-segaganiwazozef-vumuxanuxuge-tupak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_5fe455973a4c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_d072abb3a4d74fc880de93a73584d33a.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_cbec2629360e4aafbc0bbc907ecfbefb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/fagaserugarapubog.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_e1a7305221d54121a8da5aa49c3bfdc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jexijer/jiref.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_e8e508a8075b4da18b668ae13ce06128.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 5676 bytes
SHA-256: df90f1e842a43a248b72fc0024330343aa7e00c30c0523999cd0b8384e80477e
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 10348 bytes
SHA-256: dfd06d6157956492297122015c65b0789e410b9c8746c1e18a07cef04ccaa5b4

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