Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c81aa01b4bcf13…

MALICIOUS

PDF

76.6 KB Created: 2021-05-12 10:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc21996efcd8f3009f777fa4b1e71814 SHA-1: 15e4294754b5072c1cd52c499ff3d8cfdaf0ea3d SHA-256: b8c81aa01b4bcf13cc67f1be58df6d144af538685d17d418d2569568f2531ee0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://botokaw.ru/strik?utm_term=sports+illustrated+swimsuit+issue PDF link annotation
    • http://lnstagramverifiedbadgeservice.com/sports_scores_live_updatesnh93j.pdfIn PDF document text
    • https://munizifazu.weebly.com/uploads/1/3/4/3/134354015/pamada.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/dimunarup.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/1256975.pdfIn PDF document text
    • http://myirn.icu/edb_file_location7m3lz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472486/normal_6004fa6f382c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_604d940524e8a.pdfIn PDF document text
    • http://meetcabinets.xyz/nupakuwemeutnu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_5d6b9b55f1424539adb19abc057c3baa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/gokaberijexopaloti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408a67bf-8a8a-4dbc-b484-9c0f6a9a8c5e/21853878588.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/brass_quintet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ca26eb-f9d4-4b97-bc9c-376e88d8a60f/is_the_aswb_exam_hard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64054134-5d59-4a47-a8b6-b89944d102dc/how_to_smash_a_competency_based_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/poxametaduredufifa.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_3f15e72a2d1f48828d85c13dbfee86f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9772c0-efbf-456d-b6ef-21d3fe4f78ff/psychoanalytic_theory_freud.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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5300 bytes
SHA-256: 8eb00f013a2f9398ffb368d2211e3e2034b5722af157a4d9046e639e4cf1d950
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 11108 bytes
SHA-256: 660ef6d74b23e6d0101a261188ae075af587046f4d50615c5b0765de4e87caab

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