Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7efc392341f5ca…

MALICIOUS

PDF

72.5 KB Created: 2020-11-20 14:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fd8fb07d080308fec9491319c27a0461 SHA-1: d907fba04e8afa02e35a6a474adb2c38a70b70fa SHA-256: 1b7efc392341f5ca14fc51c96b6b4165f136dbd100064ead864f541dfa5b2dde
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://trafficel.ru/strik?utm_term=power+yoga+sequence+pdf PDF link annotation
    • https://narebojabow.weebly.com/uploads/1/3/4/2/134266185/4f6312d7b9fd.pdfIn PDF document text
    • https://gifalixes.weebly.com/uploads/1/3/4/5/134593917/pusolatijites_juxugukivuf_jufirav.pdfIn PDF document text
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/tozulewaseser-tamunoguduxunil.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/2635266.pdfIn PDF document text
    • https://pawikewam.weebly.com/uploads/1/3/4/4/134445239/1824263.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/wafaribikova-xubotikomabana-zitanaxedaga-wukagogajuv.pdfIn PDF document text
    • https://jutaxusuwixesel.weebly.com/uploads/1/3/4/6/134678787/kifulotesof-beduparufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/campbell_biology_concepts_and_connections_9e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0938d781-a01c-4480-878d-c66ca74e91c5/cullman_county_board_of_education_alabama.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/56634604863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0fb70f4-e530-4e67-b19e-8fad32182b72/lifoxajupawekubex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a9b67b-473c-4b2f-b284-86bffd001256/rodosexemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a421752f-a1dd-4551-b9b7-29ff38557b5d/zuwavepodaluwu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/functions_of_central_bank_of_somalia.pdfIn PDF document text
    • https://s3.amazonaws.com/sirasu/xifuzolemujoxirijezuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53e6873-b4be-46ff-9af8-d103f64ca96d/2338905156.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5612 bytes
SHA-256: db9de444c7c57359b1a71c132e1340a78ffb7ca6866d2293b6abe5f81739f21d
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 10428 bytes
SHA-256: 82605a010d06811014dfbfe76049ea105248efcaaa44b9f9bccb83d1c251bfc1

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