Malicious PDF — malware analysis report

Static analysis result for SHA-256 e883322f020b8fb2…

MALICIOUS

PDF

90.3 KB Created: 2021-03-15 22:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b52238770056abf5ae08ef2cc32e5a9 SHA-1: 12cfb63f1854d0903877dbad20d00898524a5fe7 SHA-256: e883322f020b8fb277c59a1cbb8e5e1f5333722f9ff987c8a61a0498c55b0d89
186 Risk Score

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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=encyclopedia+of+chart+patterns+second+edition+pdf PDF link annotation
    • http://gifagudilul.mypressonline.com/gerepikarufexajiguxal.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/catechism_of_the_catholic_church_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_603bf9f9353fe.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/dRgfjhM/dudumi.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/gYRcmr8/radio_disney_music_awards_2018_bts_performance.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443329/normal_5ffc59b11ba7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_5fcdab8eadbe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fcddc7f7d058.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/the_book_of_secrets_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_3c42c73ca85043d28f0bdad8bededfd6.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_6fd81d04d0fd4ba89605efc9a8412ec9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b41200-ab98-4cf4-b50e-b0630e26d95e/fulejutasanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35e5a5b-e9d1-47db-b879-3dc2d72f1c33/starting_life_together_quotes.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_ad7ceca4a94c47a89eb9a7f67ca01c18.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_22073798f221492e8822a6175b84cbf6.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_48ccce57b0fc4343a5f7f5153fbc0b1a.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_6e39127b412c47bbb241bac3de9dec16.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_508e53d89b5543b5bd9d6e61cfffe55a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73236584-4a3a-4ae7-a215-04fb2541eb49/reading_pop_culture_a_portable_anthology_second_edition.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_424ed7ee2eb4481086c200d2cb467f14.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_567eeaefc3d04d03ba681546c09869ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1504ecd-e815-4bd3-a575-5eb19de3a222/32491741001.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012b45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B45 20568 bytes
SHA-256: bc73b2bf5b005b326818db7aa9eaeb9b22fc9f59771275b967431b3faf595002
font_00_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5092 bytes
SHA-256: 9386e7fd93e155a3a623592b219e9caa122698752213610898c82c81ee726e43
font_01_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 11684 bytes
SHA-256: a0e15327e8c7c718d6ecde7fbc2c1091e3db1c2a195db247156362355a6ab59a
font_03_sfnt_off00014c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C80 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c