Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e891eff656d84c…

MALICIOUS

PDF

83.5 KB Created: 2021-05-26 02:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86a2597eaa5717ff5daa19b01aec0ce0 SHA-1: 802313c1237f68c155d7a4b66eba88f207a3a80f SHA-256: 37e891eff656d84c85dcffe949c4633396718781812dd21f0c1a88bb42770985
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 0.9970

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://seumenha.ru/strik?utm_term=what+questions+are+asked+in+driving+test PDF link annotation
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/zapuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_6049fdd2383df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_606b09a1e2f59.pdfIn PDF document text
    • https://takojetomegupaj.weebly.com/uploads/1/3/1/3/131382497/2376586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_6064e58182235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_605d6d5f961f5.pdfIn PDF document text
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/8344638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_60250d515a352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5ff914d5aa699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5ff5cd1a53ce4.pdfIn PDF document text
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/70a1e.pdfIn PDF document text
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/6309079.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/bomebimediluj.pdfIn PDF document text
    • https://vazaratel.weebly.com/uploads/1/3/4/0/134017227/60f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_601fee14b53b0.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/wujadulonodu_rotoxamigon.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/081aeccf-038c-46a6-93fb-cda1fbb899d7/vamizixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120fbbe2-d172-4ce0-8e8b-2a9e3b07a979/wifaxudewilax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8a784b-22ff-4554-acc9-25eb043e6681/lexivot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5c5280-2baa-447f-a36d-a11e612e5987/cinderella_and_four_knights_ep_15_eng_sub_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f72369-b2ef-4d78-91b1-93ec23a79f49/voxulitemivenagomikujaxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7be418-1da6-40e2-8fe8-978167bbf17e/lalid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301f3a58-1a5c-45a5-84b8-f6554e0d6496/3381123159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7198a8d7-9033-45a2-903e-08884910caab/the_killing_joke_that_made_batman_laugh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b629677-0da9-40bc-bccc-92f9f2f3d707/how_to_connect_mpk_mini_to_mpc_essentials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b87cc6a-7f2c-4ea1-991a-02c112f64150/how_to_fill_minor_passport_application_form.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_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 5316 bytes
SHA-256: 83dc86e731fc31d5ca530b982d6ac3b37c57675eef29eb64d130b1f67b3adff8
font_01_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 10568 bytes
SHA-256: e129e2afaf75b59581278b3c990781b3fcfaf6be563a3ddac44472e9af1896b6

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