Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe29b910639d69e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-21 04:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ba3b859708ef9a875123d802bab84291 SHA-1: b33653cceed7674f734a0bc1aa7882fcc71b3f0e SHA-256: 6fe29b910639d69e68ed1adf336c7489f1592b9f05ef2ff107dfd315824fb8be
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xikodixugab.weebly.com/uploads/1/3/4/7/134707070/3845d8c42085.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_602bdae9d5efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_6044cd78968ce.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/amharic_afaan_oromo_dictionary.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/mixosisal.pdfIn PDF document text
    • https://navuvosukogeguf.weebly.com/uploads/1/3/1/4/131454151/9028085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60369df12ce6b.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/who_s_afraid_of_virginia_woolf_script.pdfIn PDF document text
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/5368234.pdfIn PDF document text
    • https://tajolakafu.weebly.com/uploads/1/3/1/4/131454466/8245887.pdfIn PDF document text
    • https://gejekawuxo.weebly.com/uploads/1/3/4/4/134497426/5391562.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/06103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465262/normal_5ff9fe1c2f6f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_600e776c2abe0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=kitchenaid%20food%20processor%20dicer%20attachment%20instructionsPDF link annotation
    • https://uploads.strikinglycdn.com/files/291bae1a-b6f2-4970-ad1b-4438caa15856/how_to_get_rid_of_chilblains_on_fingers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb1bd71-c532-44d3-b6d3-8f719eba2e9c/ar_15_lower_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f60b4b7-7d52-44e2-8237-6494e7dc3255/who_is_the_richest_gospel_musician_in_nigeria_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cca46bc-c7a4-400c-b578-c17a4858973c/sentence_fluency_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f2c81a-2db0-4cac-a6d3-836668efd96a/free_tableau_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cf49a7-95ea-4776-a7a1-5ba711e3ebd9/mupamow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268abef9-df56-4417-8600-8993713b4fef/funepofelojebuxowuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b7a728-bc4e-48a8-8a00-6af94eaa8717/50947149216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbe6108-f2a6-42aa-b8bb-00e8c27eb2a1/79396739803.pdfIn 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_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 5332 bytes
SHA-256: 134e936d203c9c7966794d72f1f1bfc8c45d4a1bce98ef60cf8b8496421f0e1d
font_01_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 10644 bytes
SHA-256: 8635ddff4dbfe6dd78bed8021f07bb799320a463019d520656ac2a11ba44821f