Malicious PDF — malware analysis report

Static analysis result for SHA-256 579c75a5574ef4b4…

MALICIOUS

PDF

97.5 KB Created: 2021-06-11 19:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba32f57682fa76b1054dde6eded58817 SHA-1: c514c850b6dcacef7ff2e369823dc11513782efe SHA-256: 579c75a5574ef4b46130170dd51ff85e0f214fb85a8dec12bc5f00bdcbcc7b68
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, with one pointing to a PDF link farm, suggesting a phishing or content-distribution scheme. The embedded content, though heavily obfuscated, appears to be related to a Telegram channel lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/pbw?utm_term=bollywood+old+movies+telegram+channel
    • https://cdn-cms.f-static.net/uploads/4424991/normal_601fb14d988fa.pdf
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/lajigoxoji.pdf
    • https://gujuxufun.weebly.com/uploads/1/3/5/3/135398829/xowuxosowilavaf-tobiro-figejeginuruku.pdf
    • https://zabebopid.weebly.com/uploads/1/3/4/5/134585494/sukemafazameferonawa.pdf
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/mikeg_notuz_jigipuvugusij.pdf
    • https://bilidugudixuxo.weebly.com/uploads/1/3/4/9/134902455/febirokisawiz.pdf
    • https://pujuxapalijened.weebly.com/uploads/1/3/6/0/136009243/6750759.pdf
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6058dfc588e97.pdf
    • https://cdn-cms.f-static.net/uploads/4491926/normal_601867ebea5cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • http://zeratuwolima.pbworks.com/f/waxabosesuwabilon.pdf
    • https://uploads.strikinglycdn.com/files/d4f12d4c-4a0c-49ac-82d4-2078acc1e286/gafoxepizosutab.pdf
    • https://uploads.strikinglycdn.com/files/3cb52183-4f28-419a-96ab-23962d994d30/motorola_router_sbg6580-g228.pdf
    • https://uploads.strikinglycdn.com/files/f0edb04e-c82f-44c9-96f0-ec728e549570/fubukadiridogibufijubuvub.pdf
    • https://uploads.strikinglycdn.com/files/0dd9a4f1-b01c-47f3-b556-26134814dde5/10766742638.pdf
    • http://temopifevup.pbworks.com/f/fake_gps_joystick_routes_and_go.pdf
    • https://uploads.strikinglycdn.com/files/9c137d27-3310-42b1-a993-28fda2589ad4/appleton_farms_ham_cook_time.pdf
    • https://uploads.strikinglycdn.com/files/37f6a15c-fa57-4c6a-b11e-10aeeca0b75e/bogosagex.pdf
    • https://uploads.strikinglycdn.com/files/174ae67d-71d3-476c-abde-b3703fc5d9bf/free_math_worksheets_for_preschoolers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001009b.bin
2fe139f1485f055fae45d641b25879f73f3ddfabe5dccd6275c729be183b8cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 5444 bytes
font_01_sfnt_off0001130e.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 3720 bytes
font_02_sfnt_off00011e69.bin
a11889a0d35a463d9ea88178c45185d022063c49e8f68b6c325a9e291ced3abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 2040 bytes
font_03_sfnt_off000127f7.bin
7c9d9fa944498c1e0f238797d0319d5e2dcb4dd2dd4d00f2afd03a5d4c03be60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 11580 bytes
font_04_sfnt_off00014f93.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F93 4324 bytes
font_05_sfnt_off00015d93.bin
9eeb6c8c08897775455db6dd6dcb5587f7c3bac2204d9f15805d40deca40c25b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D93 7748 bytes

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