Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af76ad5d01e8a91…

MALICIOUS

PDF

84.4 KB Created: 2021-03-22 12:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a6af21d30d3b54d410096430b766f48 SHA-1: 17c14f98cbaea26400550006573cf88e30067e17 SHA-256: 5af76ad5d01e8a916a023a8e2e57c3c16a1c22333276977541985b27e102c5d3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=the+science+of+mind+and+behavior+pdf PDF link annotation
    • https://cdn.sqhk.co/furabafezuse/yljjJZz/fajiwoxopasiguxe.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/Cja59G0/the_factory_movie_true_story.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/jtdjdGT/vidiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_6013e7ef324f5.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/hjhijhh/duguxotarazoguko.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/id7uhfw/23816017739.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/hfgi63j/datiratefesagedir.pdfIn PDF document text
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/xutibuxotemelo-wakatixabozavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fe709000dbfc.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/msliKid/tumblr_page_layout.pdfIn PDF document text
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/rodovelipave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edbce63-1e03-42bf-8773-7c480ed13e5b/bejozurinufegifipemogexep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ff897d-c237-48fc-8c0e-7ca4b00c7d9c/xumajezovovixesubezom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a592f65-b369-4163-ad17-9bb9d09b9733/how_to_pair_jawbone_mini_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72426597-4795-43c2-8a02-1b2790be2a4b/craftsman_yt_3000_battery_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f467dcc-0388-4379-9fcc-4f62d375ad9e/adding_fractions_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2b2e40-c246-4089-97c7-2122019bd817/salvation_by_langston_hughes_quotes.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_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 5512 bytes
SHA-256: 1fbe0937a606bd1046163fa0dc49a6e81773959560494cde70fa1e588886bfaf
font_01_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 12676 bytes
SHA-256: fc5fd4ba94a50f74b8a593d5bea6de5c80d4bdcf03b866e37a5fabb6bb9c209b