Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5452b8080160957…

MALICIOUS

PDF

69.6 KB Created: 2021-02-21 15:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 72c7b9bd2d17fef3f143397c0920b447 SHA-1: d106c9a059516278e1b473d4422dc72827b57dd6 SHA-256: b5452b8080160957b36aa6605a52dec5f58aa4c412dced6542fb607b1570ec27
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=oreck+xl2100rhs+manual PDF link annotation
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/7538250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488139/normal_6000a54a6e058.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/ggZhfjf/gps_coordinate_plotter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5ff1397e0cc59.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/35eb16ff.pdfIn PDF document text
    • https://cdn.sqhk.co/novujarogoga/1yggid8/one_deck_dungeon_pc_review.pdfIn PDF document text
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/5444355.pdfIn PDF document text
    • https://zavoroxovedigij.weebly.com/uploads/1/3/1/3/131398250/mafamusotekobewibi.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/acdc7147c.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/5I7ijhd/lobuvumilusozi.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/3238325.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/zerejibixupav/jetojakofimelipikizilip.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/34319754041.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/bongo_flava_music_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/android_9_samsung_note_8_split_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/effortless_english_courses.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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 5524 bytes
SHA-256: 81c1f76675fff7e0d4bb06423f3679d5cac1a91dec5667127278a62a0486d9c4
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 10992 bytes
SHA-256: 4ed8a0287ab934a77154d1c532e10f7e0a1f22ad0432b7bb97ebf107acf33365

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