Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb05985e03a419b0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 03:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28f1b678feedc8f84facb72d802fa22 SHA-1: 2e4d539c914699808945c75f85e6f468715a495c SHA-256: fb05985e03a419b00fa0903113a9c87a02c1650fc9dd5b7b99a3605f56271ada
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier also indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a redirection-based attack. The document body is heavily obfuscated and unreadable.

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://dafemum.ru/aws?utm_term=understanding+economics+mcgraw+hill+chapter+4
    • https://cdn.sqhk.co/pubisifibuj/dL0ginc/bubble_bobble_online_unblocked.pdf
    • https://lapebezufidasaz.weebly.com/uploads/1/3/4/3/134316617/35eba.pdf
    • https://cdn.sqhk.co/baresupujar/jiichib/12865146955.pdf
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/kosebupi.pdf
    • https://kolagigeb.weebly.com/uploads/1/3/2/7/132741023/11626f2586054c5.pdf
    • https://cdn.sqhk.co/porosobof/thBiggi/matchington_mansion_cheats_level_394.pdf
    • https://cdn.sqhk.co/jujejorule/fiblQIP/usa_made_electric_guitar_kits.pdf
    • http://kaxidabifibag.iblogger.org/avery_8366_template_for_mac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_ededefe987b54913832778d78564a445.pdf?index=true
    • https://s3.amazonaws.com/sugosubexez/jupogufuwuvokimobe.pdf
    • http://dejedizanabi.epizy.com/34552974799.pdf
    • http://buvukudoxug.rf.gd/4156882740.pdf
    • https://uploads.strikinglycdn.com/files/9871278f-0be0-406f-bf44-9625fab55ab8/when_a_woman_says_what_it_not_because_she_didnt_hear_you.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_f2dbc5adc1f34bc1a3c4b55dbd0f4af6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2ac2092c-d794-4cbb-aa27-1a11912ab07d/how_to_calibrate_samsung_top_load_washer.pdf
    • https://s3.amazonaws.com/warapagefasovi/french_grammar_exercises_with_answers_for_beginners.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_off0000f02c.bin
286055e05291c3d89bcabc2717aeba14003e796f6714b404aebc8edbd4f63e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5660 bytes
font_01_sfnt_off0001035f.bin
a18cc6ba6a30f747eb5f9a81fc6ee2eadefe7c44dabb7fa3230731371b1aa771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 11068 bytes

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