Malicious PDF — malware analysis report

Static analysis result for SHA-256 df79f31bdd6eba99…

MALICIOUS

PDF

69.6 KB Created: 2021-02-06 06:00:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: baaa0dbca2163d07fdbbdc563a317d5f SHA-1: 57665729685afa76b98942c19a5f72daaec8ed51 SHA-256: df79f31bdd6eba99149ca8255c2f4110a779457a96aee0f587813ea0a83ac4ea
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/aws?utm_term=tepung+ampas+kelapa+pdf PDF link annotation
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/temabuwazowopa_zazetar_vulutigubofobuv_febozoremex.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/74b66f2d9455.pdfIn PDF document text
    • http://btsworld.org/kuwifrtrw8.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/ratadiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fe751c47f8af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527237/normal_6002742e43ca2.pdfIn PDF document text
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/xanovimopajapiw_sixez_motis.pdfIn PDF document text
    • http://qqkaxes.xyz/630461012bi5k0.pdfIn PDF document text
    • https://waferipesor.weebly.com/uploads/1/3/5/3/135307907/f30e8.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/wuwipazegabuwenodev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5ffd0a8ef3f6c.pdfIn PDF document text
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/6671617.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/vutevo.pdfIn PDF document text
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/640dee0bdb29.pdfIn PDF document text
    • http://meriline.store/japanese_kanjivvs9h.pdfIn PDF document text
    • http://rezltml.xyz/famous_celebrity_quiz_games47gcf.pdfIn PDF document text
    • http://gratoraama.website/93860112397wshra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://id.wikipedia.org/wiki/Serat_panganIn PDF document text
    • https://id.wikipedia.org/wiki/Pangan_fungsIn 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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 5276 bytes
SHA-256: fb673acc931f3e4835ab3988ab9c9881b6ca2f261e10e112ae1e2f320846f309
font_01_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 10620 bytes
SHA-256: 3fc74de072251aed91b1291642c16ebd1ad9261c0120ae96f31b2b4234e3fd83

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