Malicious PDF — malware analysis report

Static analysis result for SHA-256 534f30db96ed383f…

MALICIOUS

PDF

82.3 KB Created: 2021-04-05 23:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dcbf4fb0c48e23c6fc4c20c6a2ad1443 SHA-1: 97e2bc4536a4195962b4d8d943bcc40b08f8fda7 SHA-256: 534f30db96ed383f0d1b630c199b1111f569a1e6d0c94fcc4dcb87c8d480a68c
186 Risk Score

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://dafemum.ru/123?utm_term=probation+report+writing PDF link annotation
    • https://silatasetexa.weebly.com/uploads/1/3/1/6/131637876/gidofadur.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/481590.pdfIn PDF document text
    • http://teren.fun/left_behind_kirk_cameron_full_movie3d228.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/1256492.pdfIn PDF document text
    • http://wei-nmvc.com/vunezegasawusaboq4g81.pdfIn PDF document text
    • https://tozupefiga.weebly.com/uploads/1/3/4/2/134265365/8060216.pdfIn PDF document text
    • http://presalle.xyz/fepotagugomipxcjt9.pdfIn PDF document text
    • http://vuzaretozo.iblogger.org/8174189287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofilelajisemap.rf.gd/21371287543.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/modern_business_plan_powerpoint_template.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_8c0d12674f2a4009b539d1d506a562de.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_d218f66ecd4442db8c14ab026160d987.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_b2ec3fe5b39946788eea56376ce158f8.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_206783bb92fb4641b1aed5248fd7838c.pdf?index=trueIn PDF document text
    • http://julidami.rf.gd/can_alexa_turn_off_my_roku.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_69741187ca9647a99ba752811946f934.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/gefugur.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/speakout_intermediate_activeteach.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_dfd8dbdd27954bae84858a14b466f2a8.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 5012 bytes
SHA-256: aae9f4e6ba94a43deef6736f08fde4b6fc0a8dd0c62cc66da92a0c23b46fa3cb
font_01_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 11068 bytes
SHA-256: f8b4c560dbc087d7f15205534a5173381edce79f561321ede6b1987d580dfac6

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