Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8367b584f097cd3…

MALICIOUS

PDF

65.4 KB Created: 2021-02-13 22:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 397596fc8893e81ae58fa2d3232e9fbb SHA-1: 2da5ec0b89f460b2d1abfdb62a4510589108556d SHA-256: a8367b584f097cd325531ac3958cd51915d74c06f73f0723342499e41f70526e
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to potentially malicious sites, likely for further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/aws?utm_term=bio+information+economics PDF link annotation
    • https://cdn.sqhk.co/rawerusiwala/jhcbOjf/star_wars_colony_ships.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/43258947c69.pdfIn PDF document text
    • http://buzovanukoziba.22web.org/14115013147.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/djaLgco/gma_deal_of_the_day_may_28_2020.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/baf45eb00002c.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/drmjfci/88959168318.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/HQagemE/11301719377.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/8623439.pdfIn PDF document text
    • http://invitesistem.ru/gipixarp0k8.pdfIn PDF document text
    • http://newsportstechnology.ru/buxixikilekidigakau3a6a.pdfIn PDF document text
    • https://kiruxujekan.weebly.com/uploads/1/3/2/7/132740547/f06d6.pdfIn PDF document text
    • http://lasleymarkt.ru/pathogenicity_of_vibrio_cholerae3jfk2.pdfIn PDF document text
    • http://setlyb.online/soxatujepibufep4c1qe.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
    • https://s3.amazonaws.com/purixifusipelid/17665005296.pdfIn PDF document text
    • http://faberaladaruz.epizy.com/equivalent_fractions_tenths_and_hundredths_worksheets.pdfIn PDF document text
    • http://jazupizewatabal.epizy.com/battered_bastards_of_baseball_parents_guide.pdfIn PDF document text
    • http://fizefitelibulob.epizy.com/aequor_information_technologies.pdfIn PDF document text
    • http://zokazote.rf.gd/55224820891.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B1 4832 bytes
SHA-256: f30cc927d88d7d00896e04e92fd135b313e303e0a1de3b761bab02f13ea5184e
font_01_sfnt_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 9636 bytes
SHA-256: 165c82920c0a81c09040b994dcb2f017434875ca9ea528d25a36eaadcd5f558c
font_02_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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