Malicious PDF — malware analysis report

Static analysis result for SHA-256 4502c7dae1b3de06…

MALICIOUS

PDF

71.4 KB Created: 2021-04-02 18:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70500abc35d15546fdba69183b55d2ff SHA-1: 786d8f3e080ca4ffc56d85fc43c0ffeecbf35c90 SHA-256: 4502c7dae1b3de06386058e6df759bbaab32f0cc31d2b75ed9fc42b986f31719
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with heuristics specifically identifying a 'PDF_SEO_LINK_FARM' and 'PDF_URI' firings pointing to suspicious domains. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'karni padi badmashi video', suggesting a deceptive content strategy. No scripts were extracted, but the overall structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=karni+padi+badmashi+video
    • http://trickyturkey.com/44501210204d5xqv.pdf
    • http://trafikcezaodebayisi.com/what_are_the_most_common_medical_proceduresytpqh.pdf
    • http://segway-wheelchair.ru/business_communication_faculty_jobsztupp.pdf
    • http://kemikekedig.iblogger.org/fozobotemokebevitigot.pdf
    • http://zidelevoromuma.22web.org/jasogalejajetesejuluzal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/xugigabitulu/77838060567.pdf
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_41e4e280951d4073a755eb36a60044b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/18ca6c45-c0ba-45c7-8a91-efe9b604ebdc/i_cant_turn_on_my_panasonic_tv.pdf
    • https://uploads.strikinglycdn.com/files/7ff94980-92c5-4774-9f09-c4872ce12061/is_a_2003_saturn_vue_a_good_car.pdf
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_5ec8ac76546845d0bc224bcdbde0aa9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edd75fb5-7e57-42c0-923b-7f65a587b81f/28374775409.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/zodiduzolabe.pdf
    • https://s3.amazonaws.com/legipalofi/58249933759.pdf
    • https://uploads.strikinglycdn.com/files/52b6376d-6332-410f-9a61-3d6f724a5d41/pentair_kreepy_krauly_parts_diagram.pdf
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_ed11fbbad0e445fbbdf3d400adeb6f7a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/364eaa97-3726-47e7-aab9-628ca28706fa/how_to_apply_for_ms_drivers_license.pdf
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_dab687e5e7e646809e2a67252422e725.pdf?index=true
    • http://xovapigebiz.rf.gd/75701498865.pdf
    • https://uploads.strikinglycdn.com/files/8accd8e1-e8c4-4163-8ff2-808b01e69622/the_darkest_minds_never_fade_movie_trailer.pdf
    • https://uploads.strikinglycdn.com/files/36c5d542-751c-4331-a8e9-fbfe0db3bdf3/interview_questions_and_answers_for_teaching_english.pdf
    • https://uploads.strikinglycdn.com/files/81ddefa6-df65-4579-ad5c-961ce097a7f6/50031862695.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee8.bin
728e805d502283f3965a65a0639d0e418b2d2487ac7ec83263600bd6edfdbaf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 5336 bytes
font_01_sfnt_off0000e0e7.bin
1a4b7c5fe3dfb3c59321d476f96cf1328c81f682066abebafb1997e0d7cfd5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 9880 bytes
font_02_sfnt_off000102fd.bin
516b05aa830a8055096a6e8c0eb8b2dec71a21d3700ffd191662c13eca87d38e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 3236 bytes

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