Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4535095ecab1b19…

MALICIOUS

PDF

71.6 KB Created: 2020-12-18 17:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 52e1cecac06581dcd528716986bf2716 SHA-1: 26817724800cbd6a954ee008b821d84fed567dae SHA-256: d4535095ecab1b197a96ca08cbe0c7b87120d1cefd1b4ba77aef8ab763875c60
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious websites. The primary malicious URL identified is https://trafffe.ru/strik?utm_term=possesive+noun+practice, which is likely used to distribute further malware or conduct phishing attacks.

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
  • 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.
  • 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://trafffe.ru/strik?utm_term=possesive+noun+practice PDF link annotation
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/460440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_5fb5e59d05293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5f924583b0509.pdfIn PDF document text
    • https://kipunokazapalu.weebly.com/uploads/1/3/4/7/134774983/4605231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5fbadd97b2105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fa82e402e64a.pdfIn PDF document text
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/6c574b88752274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fab5e6e74c1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bd3cf677-3824-49ff-9ced-fa66a5a0cf23/jogos_de_tiro_na_favela.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49e018e72e5fdbcdc135/1606371809302/wreck_it_ralph_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0066e4-a342-452e-bbac-b86c8f2c4865/22re_timing_chain_kits_with_metal_guides.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10ea416f6d44b07bfaa09/t/5fc7d8fd12b0cc779743f739/1606932737429/christmas_santa_bunny_run_game_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0c3424-d0cb-4703-abaa-456bc4075876/44792356114.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_off0000cec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 4836 bytes
SHA-256: 715b0c41c7052773e93ef478efcbc8ef02b3a931ccc104fbdd7805de1ca71859
font_01_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10544 bytes
SHA-256: 1ec601e8c1e27675bf1c4b8f77e475f349331d6ed477dd535dc33cb6b56268ba
font_02_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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