Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79a3c284c5bb4c7…

MALICIOUS

PDF

78.5 KB Created: 2021-03-05 22:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 48aab72c4baa76a5ce9b01d69acf6866 SHA-1: 47d04237b9fa45e30d4a04ce9df369a7070aeb88 SHA-256: c79a3c284c5bb4c7d34eebd0d3556e01636364ed15432ba449909da4a47a3c8a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded URLs and the PDF structure itself are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=lenovo+yoga+2+pro+service+manual PDF link annotation
    • http://presentinsta.online/best_android_tablet_2018_under_10000l5i6u.pdfIn PDF document text
    • https://dunexagog.weebly.com/uploads/1/3/5/3/135303431/2c2657c65a1c9c3.pdfIn PDF document text
    • http://shtampshop.ru/84617707530abs1b.pdfIn PDF document text
    • http://peuer.xyz/siworegovewaxuqfg3.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/mepifokek.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/bc998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b75a0bd-4f45-49f2-ae57-52ed3fe727d8/36587779652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514352ab-8003-4d14-9ac8-0f4131bc1023/office_365_administration_training_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fba452-c27a-430f-a144-deca9841aa47/the_innovators_dna_harvard_business_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101b8cdc-4ae8-41af-9921-cd5680f10bd6/is_shop_vac_a_good_brand.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_c1a87e1bbfeb4394ad02e28bbe7224ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d21ff6e-5919-4333-bf4b-b74ab49026d6/2020_jeep_grand_cherokee_trackhawk_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e53fda-72d7-4809-9c73-4e66d8da4e4a/twilight_saga_free_download_movie.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_805cfb82558e469786d89eafba19d238.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d37bae-4f74-4428-9e92-6136f908d41f/wafolifokapojava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f534af3-5142-446f-9f0a-bc29a7781efa/is_cra_my_business_account_down.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_8989afff0cde4033af82684e8d2bee8d.pdf?index=trueIn 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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 5488 bytes
SHA-256: 4c444f7a4a1ddde8625b5fc1822cb1c458f6410bfc44d147e5e37cfdae718192
font_01_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 10764 bytes
SHA-256: 7b038c30a249da5f26bf97cc8ff07aa7fdbb764aab79be8a51bcfba5d89ecc20

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