Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4af40f42af04c21…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 04:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d843b6199a5e4f0a4e4c5ab353dd083c SHA-1: 8186e25a3a6646bb14a94de59210b7c046092514 SHA-256: c4af40f42af04c21eb99635ff3efdcc4e5ddf5ef8308fcf7fee712469cd86c95
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user 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://resalured.ru/strik?utm_term=samsung+hw-j355+user+manual PDF link annotation
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/8279590.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/gaburazomadopebepi.pdfIn PDF document text
    • https://bawefutazadar.weebly.com/uploads/1/3/5/3/135310886/vikukej.pdfIn PDF document text
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/dejas.pdfIn PDF document text
    • https://xelisiji.weebly.com/uploads/1/3/4/5/134524002/de135f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hjchffv/tavatefoturusekukini.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/fjhv7jf/wulovuzadofesato.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/BjhuIfY/free_printable_animal_colouring_pages_for_adults.pdfIn PDF document text
    • http://biomanua.website/93311229142flml0.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/bakilokofuf_kazoboli_sujidonusereme.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/wobaseta_sasumijik_duzelanika.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/7a1a9ff2bf565f2.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/2080875.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/eRhdhfS/easy_continuous_granny_square_pattern.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/rurosaveruk/29116555724.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/dogosekagukowekaki.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/rakupebonituzuvefepigiren.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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 5692 bytes
SHA-256: fea310ba178348edd7646e5290a8021da1ed18a4058d723fdf3e7a2f53152964
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 11100 bytes
SHA-256: df49b2066d4e379de7a20e559f0cc2af54d287a459faecb08a20229168cfdf43

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