Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61ef4cba3f76b4d…

MALICIOUS

PDF

74.3 KB Created: 2021-05-10 21:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 62024170f35647c2e61fc462feb85e2d SHA-1: 06071da3c37afca74c388fdd238cea2f76e87873 SHA-256: d61ef4cba3f76b4d3a0f2d950f818a1c04f0035563d13b87f4ddc94a28c6f8e0
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including one to 'kuzutuzo.ru', suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, appears to be related to car maintenance searches, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wb?keyword=2001%20mercedes%20e320%20service%20b%20reset PDF link annotation
    • http://nosatines.mypressonline.com/42835329762.pdfIn PDF document text
    • http://homeolimp.com/deligonmjwhm.pdfIn PDF document text
    • http://huaweistoreukr.xyz/the_notebook_movie_in_hindi_free_dowzwt4u.pdfIn PDF document text
    • http://bluebadgeapproval.com/peg_perego_john_deere_tractor_parts_ukk9af4.pdfIn PDF document text
    • http://jadaribod.mygamesonline.org/20894894322.pdfIn PDF document text
    • http://pihodze.com/zafapagijerakiwijevevuxi01gt.pdfIn PDF document text
    • http://islta.fun/470092360239mbyg.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/29389902915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_fbcb2e94399e4ac498138b89b86043fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26613f1-5a10-461b-9dda-86f9dc9b9523/allworx_remote_phone_setup.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_89db517a91d840ceae5811397b7658fe.pdf?index=trueIn PDF document text
    • http://gemovimuwopete.atwebpages.com/lodofubafakuxugesugadi.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_bf67c350d6a1492cb87ccfe961526c49.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_bf25c50d75414977ab8b7abd3bd8ab2e.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_11bdaeff4fe44f358d571af5bd4e95be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34375efc-8f46-4dd0-b71b-daa807c2ccd4/craftsman_208cc_tiller_parts.pdfIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_ca0037e52c8c4f77b22611b1b598c299.pdf?index=trueIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_f494794024e14e0b9bbaef71cdfe96ca.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_08143011aee146dfb1e982f64f94f68b.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_c106eb4b5173497ba21d0e2650b8274c.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_3667139cd8e446298ae239338c02f358.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_3c27072f29b44df98cd17fa0bb954def.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/daec9def-b7c6-405c-8040-6a46a4b4e603/what_time_did_the_stock_exchange_close_today.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 5440 bytes
SHA-256: b763204f415df67ae1db3064c86df1a0962e0e0dce4e8e1161ac9587a5e26518
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 11124 bytes
SHA-256: 11656b1936c8fefe48317023b5575ea5d3189616d32814528e30535336d992b0

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