Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76fe6cd9e65ec08…

MALICIOUS

PDF

89.1 KB Created: 2021-05-12 08:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: edc3be7c3e4aeb5ed83d85b5cd3a9e93 SHA-1: 5854082b187d6627d1022aa9d5ba0aa23c9e5ca8 SHA-256: b76fe6cd9e65ec0872a28711912ccc1555422853e27207b2c687ea9b8793ae6a
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 0.9988

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://resalured.ru/strik?utm_term=attack+on+titan+season+4+episode+5+manga PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369923/normal_606cc7568c606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_6040ad9759ab4.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/jjjjFX7/34184239390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fe4db12dad6c.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubokave/hjicjdn/lifetime_swing_sets_costco.pdfIn PDF document text
    • https://cdn.sqhk.co/sarodeduz/cGpibic/48795270346.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/Lggjigg/tetris_99_free_online_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6016305eb3db0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_60450b09d4302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_60176d41537cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5ff3008814aaa.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/ijpz9ig/onestream_live_alternative.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/c87c2745-9f4f-412e-8aff-ca240d9aedf9/junor.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/how_to_train_a_restaurant_server.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/jagekul.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_5f8659b505c44734a5a6ec1f90c03030.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_d710699733a2402d87446f42edf64c81.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_e5c78961840c4e1db4aecd0813722883.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_34f1119005014e22a267ac3e0899d69c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c64cbe6-3562-43af-83a1-7b65069a6c89/12575746142.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/what_are_the_structures_and_features_of_a_tropical_storm.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_9e8dc0d78adb4b7e8b4d94676c24c083.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 3324 bytes
SHA-256: d72d2f74fa901683c0095098ee722a7a0074bbb02aefdd60d19b78cdc0bd56e3
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 5532 bytes
SHA-256: 62f9f178fa2a52659f4f278245f90d7e5422700bdaaed5d3c479b9d4bbff5367
font_02_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 2196 bytes
SHA-256: 33ead4eb0a6bb2aedb2ad170768d79ddfdacc78aa02b8ce2dd6de75fd3e730d5
font_03_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 11516 bytes
SHA-256: 0c058c42acede251ffa41faa8fbf4bd885ab7f63b56a93457ee09bde6bc8a704
font_04_sfnt_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 18568 bytes
SHA-256: 35587927012b4e611b948f791cc3bbfce9d767b31c3b283ed6326294dc8fda88