Malicious PDF — malware analysis report

Static analysis result for SHA-256 81259f05b97a5523…

MALICIOUS

PDF

79.2 KB Created: 2021-05-02 08:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1407e6d9a55886d61b878ac32d6b3686 SHA-1: e950760f7f11cba7472a25f17eb4e12a4d516570 SHA-256: 81259f05b97a5523c857fff12e9bee93bc35829c3075e1cd2fb3d231c8218343
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 of which are SEO-related and hosted on disposable domains, indicating a link farm or spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://maypoin.ru/strik?utm_term=how+to+charge+black+and+decker+300+amp+jump+starter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474475/normal_601bbf371da9f.pdfIn PDF document text
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/61185365cedd.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jdK4ijJ/96581111066.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/vhbYicd/space_rangers_2_text_quest_guide.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/glenfield_model_60_feed_throat_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/ha5jjhi/51930903100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479240/normal_60049394d8db6.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/mijow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_6036ac077dede.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/catabolismo_anabolismo_y_metabolismo.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/jbhdjc8/690065575.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/jack_and_the_beanstalk_the_real_story_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/hhbifgc/56832942246.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/5855051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5fedd1322837e.pdfIn PDF document text
    • https://cdn.sqhk.co/dowivita/Lq9gcic/mobile_device_helper_parou_de_funcionar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakagigoneliv.myartsonline.com/doxovamawamuve.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/wobadumajapisa.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_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 6128 bytes
SHA-256: e558b5159b0a604357b82ad2cbf086a9c04fd71b285a493d1c25c4f1062ea778
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 11168 bytes
SHA-256: 86091e2bc531d1275cbc0f975dd30232946a1cfd543bfc9ef723754f0ddce6b7

Open this report in the interactive analyzer, or submit your own file for analysis.