Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f010a3f57d4bd6…

MALICIOUS

PDF

77.9 KB Created: 2021-05-20 17:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a6c8caf01691e7cc565ea364a22039a5 SHA-1: 0b4a68a6ed5c34423b40ea04ec7876b660bc5ce1 SHA-256: 80f010a3f57d4bd6f4635149ecdad9c53c1c18aace38b8e37a15998de7aa2073
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=wonder+woman+movie+2020+duration PDF link annotation
    • https://fazofiketir.weebly.com/uploads/1/3/4/5/134507238/9614847.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/6886628.pdfIn PDF document text
    • https://lerofazoneku.weebly.com/uploads/1/3/5/3/135314691/zesapelizemedu.pdfIn PDF document text
    • https://vazemewezasal.weebly.com/uploads/1/3/0/7/130775722/zubogugokuseredivavu.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/1cb3a4f5b6d.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/769087.pdfIn PDF document text
    • https://fixuvanexe.weebly.com/uploads/1/3/4/3/134359444/tuvamijebi.pdfIn PDF document text
    • https://lenoloxib.weebly.com/uploads/1/3/4/0/134040664/4966133.pdfIn PDF document text
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/7036240.pdfIn PDF document text
    • https://bibokesoxi.weebly.com/uploads/1/3/4/8/134850131/984513c8ef05715.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/xuvamuba/snow_white_and_the_huntsman_full_movie_in_hindi_dubbed_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/guide_gravure_verres_progressifs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa299ee3-3b6e-48ac-877d-6ce7eee15fad/57880526289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feafc837-cdcd-4c0c-8207-383d3b1d90e1/sword_art_online_wiki_season_1_episode_9_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d124891-dfb5-4e67-9b9c-423d58e55163/wolf_of_wall_street_netflix_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149bd656-c5b5-472c-93d5-86454754e380/jazenoxewimewizifosiwep.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/calmato_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2032c328-258a-4d2d-a5a0-628c1fac19e9/jomiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d20a4b3-ef1a-480f-950d-54ac4c15fb15/zemijidedovuperoxunow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773a8b30-20cc-4f27-be52-f026cb3fd229/dusudonenibezuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b30ea7-407a-4d98-ab4c-4adc3c1e2663/demasokeduvu.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/xepuvenelubil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917dd2b7-d669-40d7-a63e-f18943344436/gokupuzude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fca8d92-e8e2-460a-bc5e-0247b9924bdd/kerbal_space_program_wiki_campaign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8a52a0-be2c-43bc-9583-db0ae70ed9d7/why_was_it_takes_a_thief_cancelled.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_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 5200 bytes
SHA-256: b071eda157a9b7c16e75e0190d11dc28f01af8669a5b8f156b73c379515e401b
font_01_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 10828 bytes
SHA-256: 4a5d1082688368743d64bae34efe0096ceeb11cddc3c3e74c4e99c6de49770b3

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