Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87720802288524c…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 08:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1e59c86dbbd2caaa989f63c6fbedb750 SHA-1: e1a04f3d791311f17be3dd41446bc4fdd40fc614 SHA-256: d87720802288524c131edb72d8dbd44ab4e279e0947e60a89c85cbb958dd859a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing SEO-like keywords in their URLs. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/wix?keyword=understanding+conservation+of+matter+worksheet+answers PDF link annotation
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/3797616.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/ib1RfPT/archero_guide_farming.pdfIn PDF document text
    • https://cdn.sqhk.co/lilokimoz/fhjhRqf/34684456065.pdfIn PDF document text
    • http://vivadoctor.ru/digozajuviduwebujiaz9h.pdfIn PDF document text
    • http://reactivaperu-2020.com/sirevilonojuwovatetusita8d2jg.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/9tOASii/milamaf.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/jVlhjBt/pakirapusajivanesejaso.pdfIn PDF document text
    • http://fb-ig-violation.com/nutrition_careers_without_rdv5oqo.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/ghihmjj/rukex.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/eomYTFH/feisty_greek_goddess.pdfIn PDF document text
    • http://iuts.space/zoxuluzupefugisuzuforanazdqq8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaxogesidod.epizy.com/rajaza.pdfIn PDF document text
    • http://kesajebofiruzu.epizy.com/netgear_wndr3700_default_password.pdfIn PDF document text
    • http://ripapekum.epizy.com/energy_problems_worksheet.pdfIn PDF document text
    • http://julizut.rf.gd/kivunanep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 5612 bytes
SHA-256: 9a3e9d435137342ed585682c72e9caa669bf8b652acb3e697bef5d9ded124f3c
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 1596 bytes
SHA-256: f5b1ef42b2295252c50e24bfc107edc2e330e18835c78b18151bcc585500d7c8
font_02_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 10300 bytes
SHA-256: e88cc3848e5043fafb319ccf143ca8f408f2a55c79f8de97a0b7176802fc3cf7

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