Malicious PDF — malware analysis report

Static analysis result for SHA-256 231235a95edc8f69…

MALICIOUS

PDF

73.7 KB Created: 2021-04-01 00:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 751c1cf9f829e698f56bfef68f7cfafd SHA-1: dae10f1380824f50106b7b4cc783759481851dae SHA-256: 231235a95edc8f69db96bdc729b166c3c7a88e3124471b15c54178a393a9a367
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, a common tactic for SEO manipulation or distributing malware. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=html+css+javascript+pdf PDF link annotation
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/3497447.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/schindler_s_list_theme_sheet_music_violin.pdfIn PDF document text
    • http://healsmall.space/95664232434qya7l.pdfIn PDF document text
    • http://fullstacket.online/sistemas_de_ecuaciones_2_eso_problemasaktr0.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/c5c6b940.pdfIn PDF document text
    • http://edalovert.xyz/the_buddha_in_the_attic_downloadft6qj.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/budget_2020_19_summary.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/basel_iii.pdfIn PDF document text
    • https://zixaderal.weebly.com/uploads/1/3/0/9/130969504/tumogafo.pdfIn PDF document text
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/2647679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_52524e56f43e423b95d32062eae7e541.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_a108a57813a14474a06219fcab492812.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/deathwatch_character_creation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/do_dryer_sheets_prevent_mice.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_88a8388611ef4c58ba7c4d561876bcd8.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_313d293f25d94936844c4b00f9fe16c2.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_641cae56ed844855965ab31bc36a5e22.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_776c015b360a4849b3b4463c57e150e3.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_b7fb65c8c3354905b326f66145ad7f38.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_0ee18471a5e84e499bfaf5b214a3e563.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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 5396 bytes
SHA-256: 58f4e3b99a1bd7a2208897afe19da4cc2b0e27d6798f831c6b91cc697e12f1fc
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10500 bytes
SHA-256: 202de45bdd37b7d99ff00af0385d444bedaf02035d88e917d1ad7f1142ae3fe8

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