Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626d7113e3ff917…

MALICIOUS

PDF

73.1 KB Created: 2021-02-12 05:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 63526d8b26f3b162e44e29eee8248057 SHA-1: 2139c654b0e4344d3046d101382538761f6549f7 SHA-256: a626d7113e3ff9174edf7209317883eea34aaff364f8cf3b8643c52f69b85791
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to link farms and disposable hosting, suggesting a tactic to distribute or redirect users to malicious or unwanted software. The document body, though heavily obfuscated, contains keywords related to downloading software, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/wix?keyword=sb+game+hacker+root+apk+free+download PDF link annotation
    • https://cdn.sqhk.co/zikufivol/iejhidG/singing_bowl_healing_frequencies.pdfIn PDF document text
    • http://counterman.ru/vifetno6fv.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/Kg7jshb/xezodebufipizogavadexemud.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/s0YDChf/denif.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/haghiep/89000067754.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/jhhcxjf/jupitikuro.pdfIn PDF document text
    • http://lufesemi.iblogger.org/fomaxabanivovedi.pdfIn PDF document text
    • https://cdn.sqhk.co/rivatokere/jagjbSF/63641613764.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/gQRkhgp/grand_animal_transport_truck_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/hjYujbC/vomer_bone_function.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisepivowunasi.rf.gd/93978258850.pdfIn PDF document text
    • http://ninefaniki.rf.gd/webcam_photo_capture_software_free.pdfIn PDF document text
    • http://lafasusatar.rf.gd/guided_reading_inference_activities_ks1.pdfIn PDF document text
    • http://roxegut.rf.gd/convert_to_word_adobe_login.pdfIn PDF document text
    • http://tefesapebeto.rf.gd/walevigitom.pdfIn PDF document text
    • http://komujawabajufob.rf.gd/cartoon_dog_images_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5788 bytes
SHA-256: 1aeda5d44aa1f031ed0253eb11040432a8e517fc828e960f4248b449fbf12d48
font_02_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10120 bytes
SHA-256: 92a9d7d73e3a09f1ef22bc28a7f718812ac433162dbef92d79289acb38edc9bb

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