Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c3a30b88150b1e…

MALICIOUS

PDF

77.5 KB Created: 2021-01-21 21:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 348a55e9271646b6aac7d44dce64d175 SHA-1: 79cc92f5646cc8cb118cea66fa2b92220bc36b2f SHA-256: f0c3a30b88150b1ea126c99768918ba239c83e4c295111b323f80e37d381b52e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known redirector infrastructure, indicating a link farm designed to distribute malicious content or phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=icloud+apkpure+download In PDF document text
    • https://cdn.sqhk.co/rapawaferew/vgewhiR/virtual_drum_set_builder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5fdf5b1d4eeb8.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/QbgcRkD/61133306629.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/jujhIBz/party_city_near_me_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/foxezevewa/aG2jf4v/amaze_definition_thesaurus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ff81b235fc44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_6004982d4a2e2.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/gowibusefimixefawuj.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/jggjgcC/93938315330.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/7808240.pdfIn PDF document text
    • https://cdn.sqhk.co/dozumapufa/hdMheMb/94575598362.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/6f2f18bd.pdfIn PDF document text
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/9274963.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/ditubepudimuzogeli.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/f64098d6.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/1344154.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/rebomedug/unblock_youku_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/the_breed_movie_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/44053123027.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/87806506489.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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 4984 bytes
SHA-256: 535ad4d1b8883c6ebebc86d5184f9655ba8a1bc07634e659807fd357051a8ae6
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 11024 bytes
SHA-256: 6e12b91a724cd10d6f02db274a22094fad87de95ee6790e62a18c69dc2c599ef