Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa033f25bb7703f8…

MALICIOUS

PDF

77.8 KB Created: 2021-02-27 16:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 89313fe86d9e0ba3d0eb14a4b9465fb4 SHA-1: 5450adf75389192095795463fbbaa957921fe058 SHA-256: aa033f25bb7703f879869dc027e953c7c790296f3eadb065e12eff08b64427a0
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jumiwimov.ru/123?utm_term=graphing+quadratic+functions+worksheet+answer+key+algebra+2 PDF link annotation
    • https://cdn.sqhk.co/kujusiru/gdodijd/wudujuvatitinoxena.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/8ed0862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484375/normal_6004bdeb9b4e1.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/hcEoXja/16906606225.pdfIn PDF document text
    • https://bisatabezuniv.weebly.com/uploads/1/3/1/3/131398333/kozaz.pdfIn PDF document text
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/kewasebadatajoka.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/L3bgbif/79860859464.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/og_mandino_the_greatest_salesman_in_the_world_summary.pdfIn PDF document text
    • http://securityverifiedservices.com/gozawelafegesifanefanigzcmr9.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/gjKHQ3j/royal_family_tree_after_queen_victoria.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/gezolivokefaririlejom.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/ghdgiGX/1687985577.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jcR2Ouu/xarerisubokutilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/counterbalance_forklift_training_near_me.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_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 6104 bytes
SHA-256: b806399b6b82ca2df4ad3b90f33ef1f9c83d550211ea155ab7259bf0dc3c9f80
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10392 bytes
SHA-256: 725ff3a217bba6df8dacf24247bf2e3c267f4972a5d18dd0767b2c71e75d1fc3

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