Malicious PDF — malware analysis report

Static analysis result for SHA-256 85be76c08901c163…

MALICIOUS

PDF

108.0 KB Created: 2021-02-23 14:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d0ce9737d420f7054743e04b90aaa74 SHA-1: 55ad1f9650289c71ea8b912baa8e6e81e8102644 SHA-256: 85be76c08901c163f143dd076335cf19aff8aa3281c0650cdb1389ace82e0902
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 hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

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://druttle.ru/strik?utm_term=norton+anthology+of+english+literature+volume+2+contents PDF link annotation
    • http://medyayazilimtr.com/koribijevakanegafigez481f.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/ogcggjP/25124331422.pdfIn PDF document text
    • https://rebafanivine.weebly.com/uploads/1/3/6/0/136054257/7997510.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/jbsjjij/big_business_from_my_dream_house_game.pdfIn PDF document text
    • http://buwiguliri.iblogger.org/88813907974.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/Uhcjejq/69913793640.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/gdb62LD/23547595736.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/5143608.pdfIn PDF document text
    • http://giocodigital.fun/dinuminizetowurudeturanu61e4j.pdfIn PDF document text
    • http://loleveze.iblogger.org/xosizis.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/icihwjd/78371789810.pdfIn PDF document text
    • https://cdn.sqhk.co/vimofufazexe/iejifhe/71224016046.pdfIn PDF document text
    • http://investmag.org/228619441466jh2q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidasumibave.epizy.com/formation_agent_d_escale_mayotte_gratuite.pdfIn PDF document text
    • http://wujitotulofok.rf.gd/34811362824.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_off000165b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B3 5560 bytes
SHA-256: add77d01b6d73a27b3865c8bbdb24fd0bf6f228bf8cfee8f4f7004f52527015e
font_01_sfnt_off00017892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17892 13208 bytes
SHA-256: ce82f0ec6756646e32093f4c9cf9340d801475e010c71581d63e5fde77cccba3

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