Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b49275e3b105cd4…

MALICIOUS

PDF

73.2 KB Created: 2021-04-02 09:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 983b024098e3343aa28f052cdeaa00ed SHA-1: d7fb95e74dc7754adbef5324984e3530213700df SHA-256: 0b49275e3b105cd428284458ef1b21b16f0e53fb208130808371d46055dbab4c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one identified as a malicious URI. ClamAV also detected the file as Pdf.Phishing.Trojan. The embedded URL, 'https://midufefew.ru/wix?keyword=deadman+mode+money+making+guide', is likely the primary lure for this phishing attempt. The ML classifier's high score further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=deadman+mode+money+making+guide
    • http://zugugalepew.mypressonline.com/spelling_bee_words_2nd_grade.pdf
    • http://wei-nmvc.com/types_of_energy_worksheet_cstephenmurray_answersqf6f6.pdf
    • http://zeboxagekej.sportsontheweb.net/tuberculosis_history.pdf
    • http://mitutepoka.medianewsonline.com/rem_1187_review.pdf
    • http://storeyou.store/hybrid_topology_advantages_and_disadvantagesm0p0u.pdf
    • https://bawufavipefal.weebly.com/uploads/1/3/0/7/130740211/gasuvibiritos.pdf
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/tulusosot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_0dd3c7ba8258472d8767f874f597a062.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_ac62d2e44a83445999e443f0e686ba25.pdf?index=true
    • http://fajenadiwizowo.atwebpages.com/33328028161.pdf
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_c3bea8d68b0741b38e0ce7527bc71b7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9855442a-b143-4ecd-ad0d-01d492260ace/zovibezejesode.pdf
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_c841f9bd4984409790fd0fb5849beb84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ca6dd49d-ee07-416b-bb9b-74164d18be93/67348323919.pdf
    • https://uploads.strikinglycdn.com/files/c09cc1e0-5b24-4130-9b64-79b586dcc0b7/20693046422.pdf
    • https://uploads.strikinglycdn.com/files/ae56bc46-3e2c-42c6-b32f-691dc270c43a/where_is_product_key_on_acer_laptop.pdf
    • https://uploads.strikinglycdn.com/files/87359794-54dc-4192-98cf-e9ea3b016fea/45069640484.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_d82e81c0946b4d149b1ae58ec4f678c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac5a0cc2-1b22-4974-9f1f-a6a3c9ff9c10/how_do_i_reset_my_exergen_thermometer.pdf
    • https://uploads.strikinglycdn.com/files/59f2a59b-e9bb-4da8-9a3d-24d49a5197f1/87279856425.pdf
    • https://uploads.strikinglycdn.com/files/ade5c9d3-fba0-4579-bcb7-cb1743cda3ec/how_to_run_python_program_in_sublime_text_editor.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e246.bin
d67e9cf6303ae1815fc854353b3095113ccaf8ceb961814bbf761e5e8bb1ce8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5004 bytes
font_01_sfnt_off0000f355.bin
91336dcd5f41bbcd224f682dfb07e687c0e9179d2b08026e746335419ee5df69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10680 bytes

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