Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8243733eb56d13…

MALICIOUS

PDF

77.1 KB Created: 2021-03-07 09:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 68ef34e32258206a86a0be372ab1af31 SHA-1: 498c7ab090b5a6ebeb3c50f71cc994b9c06c9eb6 SHA-256: dd8243733eb56d13a9bacfd7d992641c54f1f76595452cdb2277372292587414
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. One URL, zajinet.ru, is directly related to search terms, suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

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://zajinet.ru/award?keyword=altered+carbon+season+2+cast+wiki PDF link annotation
    • http://larijasetejupaz.mypressonline.com/how_to_drain_water_from_whirlpool_duet_washing_machine.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/downloadable_smart_goal_template.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/59437596926.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/student_information_sheet_google_form.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/kenmore_elite_convection_oven_problems.pdfIn PDF document text
    • https://bufibetotireguk.weebly.com/uploads/1/3/0/7/130739935/povobe.pdfIn PDF document text
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/mijogibuvod_zozaxofadodenur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b01dcd-2766-467b-b8ea-c0932b4e36cb/lg_front_load_washing_machine_does_not_drain.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_1dd08632eb91464d816c589470ada431.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a0fb09-2d8f-4edf-b509-f6b2f2436e70/72282058662.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_811fbc6343514454b095e686a7b3edec.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_0382d62b363f4eed949287144dc8b82a.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_dac36f00c6ad46c7b511b95bc74843fb.pdf?index=trueIn PDF document text
    • http://xafibejijopo.atwebpages.com/sakamoraguliwunumimogi.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_3c9482858f584328a4d0e84cec89c283.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_857d9a1d4d034349a3fe8d278cdba5f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b1e2ab-2c49-4fbb-8ecd-66bad95d1d4f/how_to_draw_a_rose_realistic_but_easy.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_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 5352 bytes
SHA-256: 40908b5786685c5512fe8c83ac7a59079038bbfc1bc532d75a0cf98927bb126e
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 10504 bytes
SHA-256: a477d1f9401deab364b62673806c4d5ae3b35e970d2b82abaf95c99aa5a0674a

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