Malicious PDF — malware analysis report

Static analysis result for SHA-256 724752afd379be71…

MALICIOUS

PDF

77.4 KB Created: 2021-03-22 17:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f3af1bb2158db6c236480b5c9ec055ed SHA-1: b0d1870547717d0a4375da324e535d8e2626b08b SHA-256: 724752afd379be7165e05f1a091db962ff65d16cb7189d1aec36d49d6c678886
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing trojan. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/wix?keyword=the+expanse+cibola+burn+pdf PDF link annotation
    • http://gnfcns.info/rujaxigazagiw2rtpc.pdfIn PDF document text
    • http://salonly.xyz/76575606890ngmdg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_5fdb1a19d7dd6.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/zipub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_6041f81d01841.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/wefug.pdfIn PDF document text
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/f9f6684db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_603f5d853e188.pdfIn PDF document text
    • http://voxamuzovo.22web.org/janatha_garage_songs_doregama.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/341050.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/830c53c952f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_6024eea21e482.pdfIn PDF document text
    • https://bevubulik.weebly.com/uploads/1/3/2/6/132680874/pobiwe.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/02858069ec97efd.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/3e56ab01203.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/6f524d3a-e7c7-488f-9941-8755a23368bc/what_is_mind_mapping_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386628c3-d25b-4a64-b2b4-82363def1513/vegetarian_diet_for_weight_loss_meal_plan.pdfIn PDF document text
    • http://buxazub.epizy.com/97664829315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54742098-7e2d-4cc5-8c07-93ab784e91c7/is_act_workkeys_important.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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 5400 bytes
SHA-256: aa42214a0404c0fae4e4e1c55ced439f2d98a83a5d25cccc03c15db2c8446492
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 10820 bytes
SHA-256: 1449f4399800fb9823182e8f8f11b3121ffa6ebc39a5f2f04b8ff697712bbad8

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