Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5360f9a262769a4…

MALICIOUS

PDF

76.6 KB Created: 2021-01-18 19:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f1694f12e8b4c334bcca8607d5c75f80 SHA-1: 5e1e94359c7dc6f424b7e9f99d16f44d0a294188 SHA-256: a5360f9a262769a4646a57b7a0739406e39b756baf70dcda812e4f0de3f2f268
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 or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document body containing obfuscated text related to a 'Spotify mod apk'. The presence of numerous external URIs points towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=spotify+mod+apk++india PDF link annotation
    • https://cdn.sqhk.co/fawabanof/jiiage7/tipajanowaroguperofogil.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/OiihfVq/tawulovuj.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/lofogujoj_telavuxunarej_gutase.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/04Wjzy5/fajomifomuginisebab.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/6WRHDtJ/mezuxosifosuseb.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/ijZhgjd/business_calendar_events_todoist.pdfIn PDF document text
    • https://site-1174686.mozfiles.com/files/1174686/69107921131.pdfIn PDF document text
    • https://xogiwudib.weebly.com/uploads/1/3/4/7/134715522/jefemomivom.pdfIn PDF document text
    • https://cdn.sqhk.co/lukizigerex/7je1rgj/word_crush_level_845.pdfIn PDF document text
    • https://site-1172371.mozfiles.com/files/1172371/new_movies_2018-_19_bollywood.pdfIn PDF document text
    • https://cdn.sqhk.co/fezozepefik/diijhhd/apache_ii_calculator_sfar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzafofefo.rf.gd/19958631813.pdfIn PDF document text
    • http://bimivopi.epizy.com/monthly_staff_work_schedule_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/county_for_zip_code_34135.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/24535832614.pdfIn PDF document text
    • http://wekumut.epizy.com/inverse_of_4x4_matrix_example.pdfIn PDF document text
    • http://konevimojo.epizy.com/jixodaguromisir.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 5148 bytes
SHA-256: 62c67fd30522f8ccb4e2e186ee0a7cae8a77fae2a880b703171751f349ffdfde
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 11140 bytes
SHA-256: 0da0773969f05c7f7e460a5b2321db29add83b7c9dda0accf73a1c5052e73418

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