Malicious PDF — malware analysis report

Static analysis result for SHA-256 93456819fd974b35…

MALICIOUS

PDF

76.3 KB Created: 2021-03-02 21:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e9c3ca2f5a4e0ad52ea562828cc66bbc SHA-1: 83eb8c45c1f757ad619fbafcd92845b918aaa9c1 SHA-256: 93456819fd974b35ab3e06197ee83fdff4d3185677a87a47493254ed6105bfa1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, suggesting a tactic for SEO manipulation or payload distribution. The presence of multiple external links on disposable hosting further supports a malicious or spamming operation.

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://jacksth.ru/wb?keyword=homelite%20xl%20chainsaw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fdb39cd9e1c8.pdfIn PDF document text
    • https://zozufawagizawag.weebly.com/uploads/1/3/4/4/134454621/bomodizadow-mumugisitomu-pukemifok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fccd9d4415f8.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/magowigosizipaz_tejesazamixefe_bikidabirifevo_parumat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_60313497ba762.pdfIn PDF document text
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/1612b589c9808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_60046c88bfde1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465914/normal_5fdfabf850880.pdfIn PDF document text
    • https://giponijas.weebly.com/uploads/1/3/1/4/131453823/83aa037.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/ee6a981.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/dutov.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/5499959.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/9e303d23f3cce.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/tavinidom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60113b0b69b22.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/wizakokowe/opinion_about_school_uniforms_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/background_check_release_form_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 4852 bytes
SHA-256: f2b699664855bef20ae7918b3f6c60cdcbc1dd6d9bd2d2a736219c874060cdc5
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 10004 bytes
SHA-256: 2b7a7a4a297b305200e8fbdacd56c8085b49fd2dcf7c64a032ed819b53385097
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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