Malicious PDF — malware analysis report

Static analysis result for SHA-256 918fb8d60deded18…

MALICIOUS

PDF

75.2 KB Created: 2021-01-31 04:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 89324edfb3e1fe1498f63e8cd38c110e SHA-1: 12eb136d94097cdfeb2b5631ab847f091c58f018 SHA-256: 918fb8d60deded18e090d6ed7d1f234c143915ef7c4de6f78f4cc69294929b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with one pointing to 'http://pokemonrivals.online/zefefefimekemunohl94z.pdf', likely serving as a lure to download a second-stage payload. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=complete+crossword+clue+5+letters PDF link annotation
    • http://pokemonrivals.online/zefefefimekemunohl94z.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/wisuvaxubew_bapexiko_xizifaxebosivub_bovidi.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/00Zx5wx/gavinosesativesevijezeto.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/jhgJheg/81607371131.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/jgjgj5B/upper_respiratory_infection_definition_medical_dictionary.pdfIn PDF document text
    • https://nuvipepive.weebly.com/uploads/1/3/1/4/131409498/pikubaluvopino.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/7213381.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/lulelepese/74096099099.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/ansible_file_from_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/30832411019.pdfIn PDF document text
    • http://gilasorizarer.rf.gd/latexagax.pdfIn PDF document text
    • http://merojupamen.epizy.com/58927736026.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/cardiopatia_congenita_cianotica_y_acianotica.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/fairy_tales_and_nursery_rhymes_quiz_answers.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_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 5132 bytes
SHA-256: 9a4554f2ecdda54cf05752370af612072d36c6d7131607145f67268fcadd1069
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10520 bytes
SHA-256: 53dc120a066a255d380cb5e055bfee2cf6a894ff9243c6b6508be7480914602b

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