Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f98430c71cb9f48…

MALICIOUS

PDF

110.0 KB Created: 2021-03-29 23:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4f6018d5846553c9a487818da8d9a46 SHA-1: ba0da37972dd11e38ce5def8567d0e2ab10bac33 SHA-256: 4f98430c71cb9f489ca17c29608ac9495f4e551852e4fd9c23e764ec99500519
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files on suspicious domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document is designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=heat+exchanger+design+calculations+excel
    • http://rawenspant.online/faxepitawiwoseblgad8.pdf
    • https://tatelemu.weebly.com/uploads/1/3/1/1/131164239/5931915.pdf
    • http://supernefritroller.xyz/ti-84_plus_ce-t_gamesdpg3i.pdf
    • http://moymagazin.xyz/damian_jr_gong_marley_albumjxqgv.pdf
    • http://rujisuki.mygamesonline.org/anatomy_of_eyelid.pdf
    • http://magicwoolshop.com/53289093350mj6vm.pdf
    • http://zekaxezixil.medianewsonline.com/modal_verb_english_grammar_exercises.pdf
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/8976314.pdf
    • http://smm-target.ru/47406824625cxpaa.pdf
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/buzubol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_0eb1a96763be4bde85497bdf4a700a22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ac7c07d-bf51-4556-8c52-5196926a821a/walmart_pharmacy_refill_number.pdf
    • http://lurolubudoruk.onlinewebshop.net/lajogi.pdf
    • https://uploads.strikinglycdn.com/files/77e989bc-c540-4529-9c50-3fc6b0fe7630/kexifejugus.pdf
    • https://uploads.strikinglycdn.com/files/ec2eb94f-89a9-4cc3-a652-0ac59025f24f/libro_la_carta_a_garcia.pdf
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_3c691b8c9e1940ea9a759d9f787f6d78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb3f8d93-e673-4f01-9e0e-4b8ad81fa15c/7748813840.pdf
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_239be1443ac5490a90475574f8c8f5cb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d77aec2-8e9f-4e12-84ee-7f365951e390/defeponelifagu.pdf
    • https://uploads.strikinglycdn.com/files/db0d53ac-ffa7-41e0-9ae0-3b6c01ac6446/2004_ap_physics_c_mechanics_multiple_choice_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e67.bin
ef479bb8dc6c3f9ffac0a2fb0c93af700a8f771c94f399b9562c0142d6ccbbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E67 5228 bytes
font_01_sfnt_off00018024.bin
042555740805ae9f9b54da11c0a754bb50e6ba5e5cd5d74f015ee534129feb8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18024 12520 bytes

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