Malicious PDF — malware analysis report

Static analysis result for SHA-256 718ff16056b409b6…

MALICIOUS

PDF

88.1 KB Created: 2021-04-10 19:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e1fa4fde451954c3724b25f5f0bba08c SHA-1: ebc5d1f2226234ea1d5a5181578cc08b3623f439 SHA-256: 718ff16056b409b63785b9d2d6a0dd4cf8bf5fb77a872ca592967817b468f5f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=advanced+engineering+mathematics+greenberg PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5ff447a8d1267.pdfIn PDF document text
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/giwagobagibodudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fd0860910001.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/pusikezosiwolirolav.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/cc93f5efc.pdfIn PDF document text
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/wofodofolimadufope.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/muxaseji.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/kigavanus/oxford_word_skills_basic_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/tumusakaparejapu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/81653488671.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_c2652eb615384181b3ff6dd1777115fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/what_is_auld_lang_syne_stand_for.pdfIn PDF document text
    • http://mifevup.rf.gd/doute_sceptique.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/gogaseseduxinu.pdfIn PDF document text
    • http://rokosarod.rf.gd/biozone_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/char-broil_performance_gas_bbq_4__1_burner.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/nulesalux.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_21772e4133064b5682708780dbd31131.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_5c7505e3b4b54df79a8d63adf293b2a4.pdf?index=trueIn PDF document text
    • http://fogevodazeta.epizy.com/zidujonetekuxolif.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_be4a38b9b0864aff91ab95e3e6a42c8b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 5512 bytes
SHA-256: e42d9765e9e7e95c8066bd4d01f242eb367e032b55efa4184f06e48608709d71
font_01_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 11760 bytes
SHA-256: 0af154c398212f6cf6cbbef2cad236d8b862fcdb7f82a549a5c86fbf1f3aa525

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