Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4de61083197369…

MALICIOUS

PDF

71.8 KB Created: 2021-03-20 19:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7c8c52dde1afd09705bf68cbef8adc41 SHA-1: 2405e97e728b4035173fa5c8b8fcfc325ef78fd4 SHA-256: ed4de6108319736964ba94093c33210c2e6a2f890ee4950fd36a3c99a9edc02c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs, including one with a 'strik' path, points towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=maytag+dishwasher+quiet+series+300+does+not+drain PDF link annotation
    • http://limuzinof.ru/mopesosotiridoruvepufufojk7kwn.pdfIn PDF document text
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/62bd1ca0a.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/1399143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fef0d260434d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_6040fa8a86752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60504c553959b.pdfIn PDF document text
    • http://vvd.bar/receptive_and_productive_language_skillsa2h3l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5fcff28d24e9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/how_to_clean_a_coleman_lantern_generator.pdfIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_23d9d434cb6145c2baa96c8696f62943.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_6db3213c16db407da6e016292c209f6f.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_bd268bd35b47436d98bcf8b67bf48467.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_75989b6a523e4c94b9c2c5d59eb946e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/what_does_the_bible_say_about_a_womans_role_in_marriage.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_e8dc102488ba44149cf2d975a9441b5b.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_deb4b9c8c3ed4effa8420d3b24fa1890.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_c6846b5f1c66453e8300b39d45f97a6d.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_721b495810794cdd8f9c978fa1c7459f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/shooting_stars_meme_video.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 5684 bytes
SHA-256: efdfe746e3fc7832d55725c7654b643c03987f17d69e663f63d471ee9f8134e1
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 11324 bytes
SHA-256: c03f28ce908b95c3539a4812779d19237eb1d5cc59b1202fccd5dbcd66a48963