Malicious PDF — malware analysis report

Static analysis result for SHA-256 779d581549237939…

MALICIOUS

PDF

185.2 KB Created: 2021-03-14 03:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6810480ddb7c72529323596ac58a3401 SHA-1: 090b3b4337754035243d34911a61eab4621c36dc SHA-256: 779d5815492379398e5b501cd30e7cf4464668d6ff586b6f5218f3589287b74d
126 Risk Score

Malware Insights

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

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 0.9984

Heuristics 5

  • 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 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://lozipotod.ru/wix?keyword=danmachi+sword+oratoria+volume+9+pdf PDF link annotation
    • http://tejitotu.iblogger.org/collections_in_c_interview_questions_and_answers.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/mapawumafibasuzulo.pdfIn PDF document text
    • http://vosalax.22web.org/79228445421.pdfIn PDF document text
    • http://zakilifawurafed.22web.org/47128862216.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/99620742269.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/zepadazewibakamugu.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/4656313.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/xapofifa-kawunir-bovuborofisum-wigolefup.pdfIn PDF document text
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/8465627db8fa9.pdfIn PDF document text
    • https://kulabukotijol.weebly.com/uploads/1/3/4/7/134703535/8630172.pdfIn PDF document text
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/kumete.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/wadit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://memegimowa.epizy.com/18880786264.pdfIn PDF document text
    • http://sitojedakolotil.rf.gd/xezosozi.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/xasopikipefen.pdfIn PDF document text
    • http://nivigiwaragere.epizy.com/pazudo.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_3cf381c65bcf4d2595088f1c284b44fa.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_d608fd9bb64143c3813796d5944e79aa.pdf?index=trueIn PDF document text
    • http://mobotifiriw.epizy.com/boy_scout_handbook_requirements.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001bc44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BC44 68824 bytes
SHA-256: c4a5120d5f86b906a84bfcf1f38711763828593b7f1c59e0ea4ef59052856a92
font_01_sfnt_off00028be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BE9 5584 bytes
SHA-256: e23f9022d6f268cff05d73bf98a539db1cb642fdf4c3db2fad74b7c6b1437294
font_02_sfnt_off00029ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29EC3 11608 bytes
SHA-256: d43a27a1fcbccd76ed4b3b7d556a181395e55cb2ebdd41e27b52f881128ca05d
font_03_sfnt_off0002c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C5AC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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