Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a1bd1fafd0cecb…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 22:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 28b7ec2b50a95dbbbbe4cd9ba6349acc SHA-1: bb233b51df3ecc3322812f88e28bd8516418fd84 SHA-256: a7a1bd1fafd0cecbe63293edbe0b11579e76299538cfaac6840814101d669f0f
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=book+report+template+for+3rd+graders PDF link annotation
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/25c58455caf24aa.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/kemutavukesukagu.pdfIn PDF document text
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/fudeva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_60097c8f8f5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_6056e8b89bac8.pdfIn PDF document text
    • https://jumalevejuza.weebly.com/uploads/1/3/4/6/134690248/71ac1.pdfIn PDF document text
    • https://xaduvipejejex.weebly.com/uploads/1/3/4/6/134631107/5e52bd.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/fexisageriku_makile_visuwobozosafog.pdfIn PDF document text
    • https://niloberu.weebly.com/uploads/1/3/0/7/130739427/e69979.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/r_squared_and_adjusted_r_squared.pdfIn PDF document text
    • http://wewudiwiwojob.22web.org/47291966660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_602ce19897a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_6057b0e26ef2e.pdfIn PDF document text
    • https://wujuxibivotalo.weebly.com/uploads/1/3/1/4/131453464/f0f74843104e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fe4e23c020c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_604364906ff8f.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/mikomojukarurit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/schizoaffective_disorder_dsm_5.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/lulakumopat.pdfIn PDF document text
    • http://tebubire.epizy.com/78908115568.pdfIn PDF document text
    • http://nidubopavoxu.rf.gd/delap.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_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 5636 bytes
SHA-256: ae0d606a6cba64758249cdd94051909d54ad7a2ffdc200b4f1fb5733e89ba58c
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 11032 bytes
SHA-256: 1e626654c2652a7453c61505fb8be34e2061fe819ee6991e4ba013bdb69a04b7

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