Malicious PDF — malware analysis report

Static analysis result for SHA-256 2351e57a656e91ce…

MALICIOUS

PDF

82.9 KB Created: 2021-04-10 02:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7a1a724d43ddd1d738a55cde8becb5a SHA-1: b84893acd1f7a6404e38122e8c81dc8978a63e37 SHA-256: 2351e57a656e91ced89d0b00eec1100d60562b158e2f9ff60cb731b76de1e8c4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO link farm designed to redirect users to potentially malicious or phishing sites. The embedded URLs and the heuristic firings strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=cooler+master+haf+932+manual
    • https://cdn.sqhk.co/xasexuwosul/SjgdUje/turn_gift_cards_into_cash_app.pdf
    • https://static.s123-cdn-static.com/uploads/4416316/normal_5fc9a220b8a66.pdf
    • https://cdn-cms.f-static.net/uploads/4464700/normal_604faf8ea8fad.pdf
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fecd16dc0648.pdf
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/e83ee36.pdf
    • https://bisulejejokix.weebly.com/uploads/1/3/4/0/134042342/3001990.pdf
    • https://cdn-cms.f-static.net/uploads/4479917/normal_606cab3f6fce9.pdf
    • https://cdn.sqhk.co/zewezerezi/9id6RfZ/coupons_for_mcdonalds_october_2020.pdf
    • https://tofoboloronu.weebly.com/uploads/1/3/1/6/131636632/1159903.pdf
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/c94d2b1842cad7.pdf
    • https://cdn.sqhk.co/megopofe/WihWDbP/juzarem.pdf
    • https://cdn.sqhk.co/detatakev/hd5jjjh/verekafetijegewikigowaxoj.pdf
    • https://cdn.sqhk.co/bovutolomevo/fJnflrG/tagez.pdf
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fe2575d124cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_1a2e4eff486a4546ad1bd39a507aa074.pdf?index=true
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_b9d5095a4e5e45799b5cb213e54f78c0.pdf?index=true
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_fd32eec09b1b40adb2c77cacc4c41fc1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/232fddf9-e522-4f2c-bb4c-3c798f415b56/powerback_5250_generator_specs.pdf
    • https://s3.amazonaws.com/zizene/fha_guidelines_for_having_2_fha_loans.pdf
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_2709b75525aa4b789cf698545159b814.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de97c18f-8c75-42fe-a71f-ae13b7b5b48e/shark_navigator_lift_away_pet_upright_vacuum_uv500wm_reviews.pdf
    • https://s3.amazonaws.com/muxozuvalubi/alienware_17_r4_manual.pdf
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_301def26af134a7681fc80ecef3a7060.pdf?index=true
    • https://uploads.strikinglycdn.com/files/accee80d-8d79-4c57-abf9-a399267dfd5a/48569668752.pdf
    • https://uploads.strikinglycdn.com/files/1df394c2-5d44-4510-ac79-c347752a3daa/zogap.pdf
    • https://s3.amazonaws.com/wibadinavosunom/bose_quietcomfort_25_apple_for_android.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_off0001032e.bin
e664f254d3311aa639b759fa099857772ec54e7a0fa9018da60140fbc3ea04f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 5364 bytes
font_01_sfnt_off00011532.bin
66470c7acccd8f03d16fcec7537f527dba5c8dfc0a479adacde95a5d53513413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 12640 bytes

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