Malicious PDF — malware analysis report

Static analysis result for SHA-256 621dfae3d39d0b8d…

MALICIOUS

PDF

84.0 KB Created: 2021-04-12 00:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0df3bc3c276e289c1b3784b1a0e7f5dd SHA-1: de93c1595df3757a2a4f7ed7de74a20deba94594 SHA-256: 621dfae3d39d0b8d358f0aeaffad7e6fe70c71e4edeab7b3e31b7a3db4292f29
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=the+4+disciplines+of+execution+chapter+1+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451206/normal_6041ea71a1ae5.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/gijfnjf/60410306375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_60170a629a05b.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/2013884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5fee0d4c58436.pdfIn PDF document text
    • http://blacklaser.ru/english_speaking_exercises_for_beginnersk4wfg.pdfIn PDF document text
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/5256293.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/qhhhhhd/ludipebebefiwuz.pdfIn PDF document text
    • https://cdn.sqhk.co/tesadubozino/8hhhjjq/kezezixovakori.pdfIn PDF document text
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/4753497.pdfIn PDF document text
    • http://coupons2020.info/is_purgatory_in_the_kjv_bibleekvc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_60325a98a2bad.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/70879664385ip46u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_602c7f04da681.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupuwulawe/jeBijKF/guidelines_for_scriptural_reasoning.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/2446491.pdfIn PDF document text
    • http://ogranicbio.fun/basic_theology_by_charles_ryrie_free_downloadkr36j.pdfIn PDF document text
    • https://cdn.sqhk.co/xobadata/bhbugiq/guwaxa.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/mesixadelomomo/soccer_strength_training_programme.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/wakut.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/zavewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58275ce8-4ad8-4477-9c6a-868165da7d43/zajaruzerakaseponaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3643909-2911-49d8-a8c4-ca0aff58a0d6/36725033148.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/fourth_grade_math_worksheet.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_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 5656 bytes
SHA-256: c36e79a2c5e7c5110401efb5c6a829784fa701de7f07128cb14fbcb832139097
font_01_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 11144 bytes
SHA-256: 3eda7ea62c0870e1ca2c6182aaad275978e9b368fd9f1d4c25828e9e13ba5eb4

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