Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1a71cb18da8ee4…

MALICIOUS

PDF

74.4 KB Created: 2021-03-19 16:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 87f147bf2a1767fe4b5e4ed97372e398 SHA-1: ba753881659012d3a6c577baed042fbc68690b0c SHA-256: 2f1a71cb18da8ee47f9b5c1ba5b4c480dac463da013c79bd3459f3b599e9cbbc
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating it functions as a link farm, potentially for SEO manipulation or to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/award?keyword=entrepreneurship+development+lecture+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/zejizoguzut/do3PoSd/knightfall_arkham_knight.pdfIn PDF document text
    • https://nuvutujozexavu.weebly.com/uploads/1/3/4/1/134131277/rivunuzulogig.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/4jghhfM/sobiv.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/47nFgce/rome_total_war_alexander_expansion_download_free.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/dizolemotamuvitivavalaw.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/can_you_submit_more_than_one_1096.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/fZt6d59/7917258413.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/ibhaoif/tuwogitab.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/sirexirivi.pdfIn PDF document text
    • http://derapom.iblogger.org/dapurogobufenow.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/hDigjgW/funny_text_message_tones_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/jegcuhf/xabopin.pdfIn PDF document text
    • https://cdn.sqhk.co/somupojebif/iegcLhc/wigefaledokeliwus.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/partners_group_global_income_fund.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
    • http://ravesezubepad.epizy.com/android_webview_error_err_cleartext_not_permitted.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/63794522402.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/98544799932.pdfIn PDF document text
    • http://loxometos.epizy.com/21842661537.pdfIn PDF document text
    • http://roninifuwevol.rf.gd/rogesolopakuderoxup.pdfIn PDF document text
    • http://sumidemeg.epizy.com/42519509166.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/6190671288.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/avenged_sevenfold_nightmare_midi.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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 5084 bytes
SHA-256: 3c2aaac46c42ae221b143acfa9cdee20e63bd0bdb132bcefb20a41c54b54ec42
font_01_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 10636 bytes
SHA-256: cacb812aa47ca81d6ab8a2c81908ba82a1ecabac7c2d29491e82aea12030c79b
font_02_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c