Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b47d8ec752d60f…

MALICIOUS

PDF

92.5 KB Created: 2021-03-02 15:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb0b8a7bc851049d6c9a0be158b21569 SHA-1: 13f9c1a1524dca708c351a8ae2ffcbea5cdcd3ff SHA-256: a2b47d8ec752d60f5648cee6afe55403d0d1c674ab56e9d97c2796e43f5df2cd
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 phishing or trojan threat. It contains numerous external links, with one prominent URL pointing to 'mezovuduw.ru' and disguised as a help page for printer issues. The presence of multiple disposable hosting domains and UTM parameters suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://mezovuduw.ru/123?utm_term=how+to+fix+hp+printer+offline+mac PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fe3f393791dd.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/5864965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_602e4d709d568.pdfIn PDF document text
    • http://ryukzak.digital/61275412889jt0pw.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/is_a_2000_buick_lesabre_a_good_car.pdfIn PDF document text
    • http://workmonster.net/povorufaba7rjrd.pdfIn PDF document text
    • http://help-nanny.site/mulumirepukiwotewawiehn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fe8e561c9f54.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/xokoxuzuredamunuvi.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/resasarisumibexuwiwikeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/how_do_you_apply_powder_to_denture_adhesive_beads.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/sweet_camera_selfie_filter_beauty_camera_apk.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_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 5200 bytes
SHA-256: a702fd711ce150d8ddbdc8b29fda843163bb3639b4e0b2c92e67afadea852681
font_01_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 11072 bytes
SHA-256: d346cdcb4393e0fc77cf5f66ecb0089ca76223da59cf727cc240941a61ef3dda

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