Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe10710a90d1733…

MALICIOUS

PDF

90.0 KB Created: 2021-02-24 19:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc77f401248d0ebd797a12b65d44be9a SHA-1: 644d5457864dbf763a1330a41f8e4fbb3b9f89ad SHA-256: dfe10710a90d1733f80daee5bea32d115036923c0d4da871e916a2bab02934e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links to Weebly-hosted PDF files, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=queen+chess+piece+emoji
    • https://tavovoxiwazufaj.weebly.com/uploads/1/3/5/3/135325502/3727ed22.pdf
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/dazadibatomek_gitezepawagi_laxigetemufiba.pdf
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/daminuruzufexodelin.pdf
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/vajakesa.pdf
    • https://cdn-cms.f-static.net/uploads/4378151/normal_60183d0f2bebc.pdf
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/mozezekuzekozi_musur_terutomuto_lifigub.pdf
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/rivonotifuz_vifefitej.pdf
    • https://cdn-cms.f-static.net/uploads/4411479/normal_6033c27d3fe84.pdf
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/3962853.pdf
    • https://cdn-cms.f-static.net/uploads/4443803/normal_60112d99cb59d.pdf
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/bunilunozulilojej.pdf
    • https://cdn.sqhk.co/bajafigotuvi/hbajbid/javifegovowosetavaf.pdf
    • http://microdigitalmeter.xyz/bocconcini_di_pollo_al_latte_e_formaggiojwm4n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sasufufa/adobe_reader_merge_free.pdf
    • https://s3.amazonaws.com/julexekubaj/terrestrial_biomes_answer_key.pdf
    • https://s3.amazonaws.com/kaxukok/fun_language_arts_worksheets_5th_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001245b.bin
06f97a7c989006f742dca0c7476c3584b276afcd750c867aa93abbd816ca82db
pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 4972 bytes
font_01_sfnt_off0001352a.bin
c299b97ab9e217825a875fa8c3454c2941c7f9cba4d4aedfe05548ccb734d1e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 11088 bytes