Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49885547f1ccc29…

MALICIOUS

PDF

114.7 KB Created: 2021-03-05 07:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 090c9bca3cce2666f6498ce11611176b SHA-1: a90530f2dfc3a80a4aa468982fd731a178458a6b SHA-256: a49885547f1ccc2911d9da145fd7df61e02ee7b084615a3617f783a7c6ea8ae9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://druttle.ru/123?utm_term=gmat+prep+reddit PDF link annotation
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/1206120.pdfIn PDF document text
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/e8342afe7c66b52.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/b585934c6.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/bigupimanigis.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/kobixerixalanotelas.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/pibazi_damoleros_kuwitazagilejum.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/5120588.pdfIn PDF document text
    • https://pefeduvoxonix.weebly.com/uploads/1/3/4/0/134017609/8175aa549.pdfIn PDF document text
    • https://gebodakejodige.weebly.com/uploads/1/3/4/3/134316683/8386856.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5f51ccbb-1e20-4bbe-ad0d-e80d7a392405/59998735248.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_18eb6978d77c423881696298a9f8dbe8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb981688-e736-4476-a83f-a44ac65db3c5/western_digital_my_cloud_ex2_backup_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3965035-ef54-4507-8cf1-e65c9a70161c/manual_adobe_premiere_pro_2020_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/proofs_involving_cpctc_worksheet_answer_key.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_0364e8c715184beda1536d3818750b5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugafebip/54098645503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dab9cc-55c5-45f0-832e-48f5ded0bb1c/is_baofeng_a_good_brand.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000177a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A6 4496 bytes
SHA-256: d3f683cd57cbffbf678f6ee389c045f2aaa7005b4971dca6c733070f09514594
font_01_sfnt_off000186e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186E8 11888 bytes
SHA-256: 652160c02d8ab985035e03557b9d8f67faee91cc8c556e86c1d920167369e63a
font_02_sfnt_off0001af00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF00 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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