Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5886513a31f47e9…

MALICIOUS

PDF

81.3 KB Created: 2021-05-22 23:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3a70c4c2b3b0bfeeae459d3c76234d83 SHA-1: 23601779d51eb1d4f409f071e0d4c52e4dce0398 SHA-256: e5886513a31f47e9735665b511ad170de84fa0aeceb600e57c27ad09770e0078
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 and Weebly-hosted files, indicating a link farm designed to distribute or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=tying+the+knot+book+pdf PDF link annotation
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/getepopakunaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_602511e794b64.pdfIn PDF document text
    • https://lakozudixe.weebly.com/uploads/1/3/4/7/134704846/vuxurapugo_jorelozaba_busumuwux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_6068ea75911d2.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/5401881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_604aa27bbaff3.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/1bd27d272ce06f.pdfIn PDF document text
    • https://rativebexatu.weebly.com/uploads/1/3/2/3/132302992/nesupalojuwe_jelilawa_seridudo_borerulek.pdfIn PDF document text
    • https://wevabubuked.weebly.com/uploads/1/3/4/5/134584052/lizarati.pdfIn PDF document text
    • https://xavuzilutose.weebly.com/uploads/1/3/1/0/131070872/pavokilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_601dcda0a3b7c.pdfIn PDF document text
    • https://tinorivixi.weebly.com/uploads/1/3/4/6/134627636/2518802.pdfIn PDF document text
    • https://nafipitomaw.weebly.com/uploads/1/3/5/3/135349771/3978ed67be7181d.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/sugoni_biwovod_vokizutawebej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453327/normal_6004ec109742d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5ffbdaf980abb.pdfIn PDF document text
    • https://pisotojike.weebly.com/uploads/1/3/4/5/134594110/d879d3bd7b.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/dosipive/call_of_duty_2019_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/jijefajaj.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/solidworks_tutorials_basic_techniques_sheet_metal.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/zebuvunigexoxaferimifenaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/sejewetulatiwikiru.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_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 5044 bytes
SHA-256: 93e1c3effd610702d5a123c300033a8ce67d20f4ca6181dc756ecc244081bd7a
font_01_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 11120 bytes
SHA-256: 44b9fb7f36bd26789c8fd0184dc64068354b7f2415b8f8ebb73e31f1a6240021