Malicious PDF — malware analysis report

Static analysis result for SHA-256 4594c11d526ed163…

MALICIOUS

PDF

73.4 KB Created: 2021-03-14 02:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3e84d9837c820264c8b81f71765e4ca SHA-1: 728264c6ec35bcdfcd35d1e5c76a5ae40e63bb4d SHA-256: 4594c11d526ed1635a62420abae35314fc6ea3b9e07bc2909d12f986a61f2ee1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with one pointing to a suspicious domain ('pelibifir.ru'), suggesting a phishing or malware distribution scheme. The presence of a PDF link farm heuristic further supports the attack pattern of directing users to potentially harmful content.

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://pelibifir.ru/123?utm_term=colours+bangla+tv+apk
    • http://borejukeluteva.mygamesonline.org/outlander_series_book_6_synopsis.pdf
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/tiweli-nebepes-gafarasomuvojeg.pdf
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/8421422.pdf
    • https://cdn-cms.f-static.net/uploads/4427091/normal_601e147e575cd.pdf
    • https://cdn-cms.f-static.net/uploads/4446774/normal_601a5a6882dac.pdf
    • http://bobujopolodusol.mygamesonline.org/how_to_draw_out_ingrown_hair.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/3d6fd07ba8.pdf
    • https://raziliselew.weebly.com/uploads/1/3/2/6/132695443/3240750.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/464ef900-9aa7-4a9c-bd7a-ab51298269c7/fisher_price_infant_to_toddler_rocker_instructions.pdf
    • https://s3.amazonaws.com/xovajukoxin/48860752299.pdf
    • https://uploads.strikinglycdn.com/files/d78c649b-2a06-48da-b8b0-1400b864d0b2/software_asset_management_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/bajuse/bloons_td_5_android_full_free.pdf
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_426ae25be88842ddafc1f3a304db9869.pdf?index=true
    • https://s3.amazonaws.com/gizonukorad/project_management_jobs_from_home.pdf
    • https://uploads.strikinglycdn.com/files/09f6c840-a5cd-42ee-a3ae-b46a07e82dca/what_is_computer_hardware_and_software_in_urdu.pdf
    • https://uploads.strikinglycdn.com/files/6ab173b3-1f8f-4521-9eb2-ae6bdf91f83c/38809200880.pdf
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_df1101b3a5504721b7d41b82965b00e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc9f3333-e687-41af-bea8-f7823d1b7b53/69942128045.pdf
    • http://jiwodiw.myartsonline.com/whats_the_difference_between_the_white_princess_and_the_white_queen.pdf
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_6179e399912b44ed84ed65db2ced85bf.pdf?index=true
    • 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_off0000d491.bin
a3d9e3dc674fc3a722ca095194b5fa21501217ea54ed6a5705f39f7d9523c57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 4992 bytes
font_01_sfnt_off0000e598.bin
0a5623e32ffd6e66b0c9b3cd8c9e68cec884414d2c474bc7e79e9b5a16a8cb6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 10716 bytes
font_02_sfnt_off00010a54.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 4324 bytes

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