Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22a4d603ab757e0…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 21:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 84cb6ef19a307e39e8f99fef19e3f843 SHA-1: 211df568b33be8b3eb83d311f46257422ec47082 SHA-256: b22a4d603ab757e06dd0131a515a1afa6e42b3c1a9f2b6cd50cb122f8990d337
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of an SEO link farm or a phishing campaign. The document body, though heavily obfuscated, contains text related to a 'roof inspection report letter', which is likely a lure.

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://fokemale.ru/123?utm_term=roof+inspection+report+letter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5ff7d5b732355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_603abf0f953f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_60126fe1dec5c.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/62cf27437602.pdfIn PDF document text
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/zesatu-nidaxu-goxenazadi-niwedidurituki.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/e65fa813b86104a.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/lepezukixulawa.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/8583825b-8342-4f99-9a66-11246f53a54a/3448144233.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_a616833ca3054525a9060845909e56c7.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_a070d13e868a458aa6f262bcc6fc1919.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44681228-dbcd-4378-b70f-3ca042086938/87674845497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f71a43-739a-4e95-b41e-1635a03c44b1/english_grammar_in_use_intermediate_5th.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_2434ff2176bc4b6596bee48323695df1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87388fb5-669f-48b1-8211-faf322839b73/easy_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56938cb1-b1fa-42a7-b5ed-dcf5c1a51e9e/58566969706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf483be-96b3-474d-aefc-6e9f86a80e2c/julius_caesar_act_4_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ce3b7d-be5e-427e-a826-de493b36e5bc/32166916760.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_20723f52761048808a99e62b0f777999.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_32db11853e324b288a124d4f0360db23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42faeca3-925d-4bd8-9cee-46284fe46acb/87826676584.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_5964fa4f34504aeea710acf8bd86b77a.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_1e1175912bc54bb490239a0281dc2b62.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_4061ee4ed00949b9a42459737925ebb0.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_d451264bc3014414be8f6b50c1f3072f.pdf?index=trueIn 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_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 4808 bytes
SHA-256: 4550bfb6168f5e1ef0013e85521367b1502ac96dc90553bcec4c49a0d310c91a
font_01_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10516 bytes
SHA-256: 4bcdc605601021b4659a681dde439de1cae0ef84968422ce4621308c7e3db0bd

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