Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2b707b33250ac7…

MALICIOUS

PDF

71.2 KB Created: 2021-02-12 23:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bbdd47987a36b17baafcaa620b8bb55c SHA-1: 4eff18ad29785f90b951d4804d0f8c3a21f3c665 SHA-256: 9b2b707b33250ac7dc24a3b34e20a3561b2d6110a4c3300e0ed1aad80f4e25a1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, identified as a malicious redirector and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'comparative advantage worksheet high school'.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=comparative+advantage+worksheet+high+school In PDF document text
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/f1c7912f.pdfIn PDF document text
    • http://dlkmvkoenv.info/commission_based_contract_templatee31ay.pdfIn PDF document text
    • http://fastgetme.online/798509795590zr1c.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/b12e5f65.pdfIn PDF document text
    • https://loboweron.weebly.com/uploads/1/3/2/6/132681880/semumob.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/sodivumuwo.pdfIn PDF document text
    • http://websecurer.tech/unbreakable_movie_mp4_free2harq.pdfIn PDF document text
    • http://reabook.online/37529851912ghkok.pdfIn PDF document text
    • http://copyright-securityx.com/fedarusixabajujosuyv217.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/kaxukok/36048510597.pdfIn PDF document text
    • http://suzimisefodude.epizy.com/46693967743.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/puzafidexidudadefelofupek.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/jalozigisexoxovaxokumaru.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 5608 bytes
SHA-256: 825d819eba52559bd6db7edce53625d0d5514f38be289c773c1488a6f4e1ab56
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 10344 bytes
SHA-256: 8ff180420c8371bc16a7ab7c6060785be77d00f34e707e523c4d6e0df6676e19

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