Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b13ea968cd4cf74…

MALICIOUS

PDF

86.0 KB Created: 2021-04-27 16:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0917e01c25ecfbc3de5fe66ddbcf4ee6 SHA-1: 18fcd705537d5fcd9ad8b60f75fd17b514a0fac1 SHA-256: 8b13ea968cd4cf7416a0e611b9ea56dff4bdf35d74eb6410c413d44b32021fc3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious sites. The embedded content appears to be obfuscated, but the presence of numerous external URIs indicates an attempt to lead the user away from the document to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=grohe+kitchen+tap+parts PDF link annotation
    • http://tvoyoproc.fun/comunicacion_entre_personas_de_diferentes_culturasc6mvc.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/bijakim_dixivotiruz_tezarugid_soropiresexina.pdfIn PDF document text
    • https://riseriku.weebly.com/uploads/1/3/4/5/134585500/wufuvudaxil-mosuvigene-zerupewivinepu.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/mJqhcQL/ocean_dream_ship.pdfIn PDF document text
    • http://shimano-stradic.ru/altec_lansing_mini_h2o_ii_waterproof_wireless_bluetooth_speakerfvw64.pdfIn PDF document text
    • http://bogplaktnc.fun/how_to_change_schlage_door_lock_code47bnw.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/sixoz.pdfIn PDF document text
    • http://hydrofthol.space/curso_biomagnetismozdrgv.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/XohCj2Q/non_disclosure_agreement_2020.pdfIn PDF document text
    • http://prolac.ru/90728246995og31f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_3eacdb394ec9416bb6b607c5ba0f0db4.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_ad907cf2de5d4b33935453ea4dccaded.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_8f9ef96f793d4619b36a8be1d75ab87d.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_633010fbb0f14cfd8c2d22dc9278680f.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_e5558fcd3c5247a0a9f0353923faffdb.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_317672dc7c2a4b73a3145eb06c4263de.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_e73ba27a621b453386a0af008d471ebe.pdf?index=trueIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_2a52c30025664af5b9015b755d1114e6.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_d8bf672d90a14d23be66509ef365156c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 5084 bytes
SHA-256: 565059e39e387d014103361a76bf28e122a35617360a519ce2b7ef087c8d8dfc
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 6900 bytes
SHA-256: 398b6fdf807f230f6f8388b1499c4931248707a07960f4d976c50a006c936f13
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 11684 bytes
SHA-256: e0fef0af159f12e096389777feeaae0b0c5e42883fb9067a790c32e65db9da3e
font_03_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 16228 bytes
SHA-256: 12025b4d7aa04fb8f69941e4d866040d4f6caaea9902973765e58cdc1b50fbbe

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