Malicious PDF — malware analysis report

Static analysis result for SHA-256 72529d90e87e9e85…

MALICIOUS

PDF

64.1 KB Created: 2021-02-22 00:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1b00f97f70c718006f575cb0ae5774cb SHA-1: 9bc94288a25a6a270fea266265100f1a19c289fa SHA-256: 72529d90e87e9e856b67ec92af975be9ecb40070f5d5f288a1340bca90d9d1fd
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection, likely leveraging embedded JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=progressive+tense+worksheet+grade+6 In PDF document text
    • http://kowezuzapine.66ghz.com/74139162714.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/dofakiloxatasojusume.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/czjB3ge/79035251863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5feaf35f311f2.pdfIn PDF document text
    • http://jusepufuwexak.iblogger.org/construction_laborer_resume_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_6011fa0aa7f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/eG3Fhgi/chess_online_duel_friends_online_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/bCI0nhg/fire_flying_dragon_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/wUghjh0/xakob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fd0674380475.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxelexudar.epizy.com/29277787316.pdfIn PDF document text
    • http://jugefewaxuxuf.epizy.com/jarrod_radnich_christmas_sheet_music.pdfIn PDF document text
    • http://ninalosuza.rf.gd/keeping_track_of_expenses_google_sheets.pdfIn PDF document text
    • http://rejufamux.epizy.com/muxabebixu.pdfIn PDF document text
    • http://widafasamuj.epizy.com/dituwulitaku.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_off0000be0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0D 5428 bytes
SHA-256: 5cfb0c8c68c506d83d38bc924614b564c4633b95137ef05d666a6248a9fb0dfe
font_01_sfnt_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 10196 bytes
SHA-256: f59a5910053e14cb9595e3e7b73afa695c3659c42f9a1fd0a26aa4990f08fe72

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