Malicious PDF — malware analysis report

Static analysis result for SHA-256 897cc37c1edff667…

MALICIOUS

PDF

83.6 KB Created: 2021-04-15 06:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1671ba050c7b03a30f63ad8885bd580a SHA-1: 2065e4c57750393bd87e8529e457a90836fcba60 SHA-256: 897cc37c1edff667f4bb982fc74d460dc6bbb63e8391a88fe03ba3ab795572a2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a tactic to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://baarspo.ru/strik?utm_term=merit+badge+counselor+list+gslac PDF link annotation
    • http://ig-soft-team.com/letter_of_credit_formn3bdy.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/5095109.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/11edcd3bc1f779.pdfIn PDF document text
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/4948905.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/zuruxujoxep.pdfIn PDF document text
    • https://bifomika.weebly.com/uploads/1/3/1/8/131856700/9313339.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/8708653.pdfIn PDF document text
    • http://weinmvc.net/gufakozuwijevamozjjra.pdfIn PDF document text
    • https://waxizeno.weebly.com/uploads/1/3/0/8/130814339/fde153498.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/69553381752.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://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_6d2155c5832645ebbf0b038da264072d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/japan_sports_tv_guide.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_e78a165724b140b3b680a02cb14376c0.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_65eb0f18eabc42afacc810e6a1c43506.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/reznor_heater_parts_fan.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/43454553560.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_d4cd5d3e1fcc491b8a345c103d0ffdaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/nitegizixefupozasozomas.pdfIn PDF document text
    • http://xenexafa.myartsonline.com/54383262118.pdfIn PDF document text
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_353a7134cb6346399d9fb8130cb8f332.pdf?index=trueIn 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_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 5132 bytes
SHA-256: 979b12578c75a0d18d7696f6290a2fc96e71cc6b74e0babfa32fb11f2ed6d927
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 11216 bytes
SHA-256: 1124cdb42ac5a827890807a8b41fe326dfe1c76a700e4c9613cc24b7528cb628
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34