Malicious PDF — malware analysis report

Static analysis result for SHA-256 d831ba10da498462…

MALICIOUS

PDF

71.7 KB Created: 2021-02-23 12:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d9a1fd0a1280b0a89569e8bf3577ab00 SHA-1: 1a20d62d1898ace5cbf8cc475b7aa04d22553cd9 SHA-256: d831ba10da498462f1dc600ea661448aef533374014254ef970a950777daf872
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://seumenha.ru/123?utm_term=hp+officejet+8600+printhead PDF link annotation
    • https://rujemezemomiwo.weebly.com/uploads/1/3/0/9/130969750/vizinanub_meratozonev.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/c0TKV9r/nick_basketball_stars_2_kbh.pdfIn PDF document text
    • http://mabay.fun/melivopobot92cd.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/3190685.pdfIn PDF document text
    • http://lesanuzununefa.22web.org/at_technocare_apk.pdfIn PDF document text
    • http://pexulabin.iblogger.org/toyota_highlander_hybrid_towing_capacity.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/b5f8949a7dd66.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/siwotalixekek.pdfIn PDF document text
    • http://thrivewebs.com/53998453432yqqc3.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/disadudibalutiju.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/johh0jd/colorshift_pearl_pigments.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/dobawunob.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/sitozi/leotard_pattern_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/83137409608.pdfIn PDF document text
    • http://javasuk.epizy.com/sklep_online_answer.pdfIn PDF document text
    • http://vedujekobizu.rf.gd/40661434943.pdfIn PDF document text
    • http://fufolisokoja.rf.gd/nokedelugizuw.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/free_google_calendar_template_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/mojabapogejedelarilu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 5348 bytes
SHA-256: c3f7b33b33ac48b12fe971936d67695f2221cf2dfc0bbc3e5408bafcc41d048b
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10304 bytes
SHA-256: 666ccbd88f1307cd8691bec49ebd57c58769ec6cb25f5d0eea50f446bc955746
font_02_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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