Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b106232b3f3d8e…

MALICIOUS

PDF

81.5 KB Created: 2021-03-18 06:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e50a541e490c71bb88a9d5e9b27fbd3c SHA-1: cca46ff2dc9de1eef0e2bfb7d492d312a91f1a89 SHA-256: 80b106232b3f3d8e7ff401e2f2c6a954fdabddb564e1cfb9bfdd54ead16695a6
186 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. Heuristics indicate it functions as a link farm, containing numerous external URLs, with one prominent URL being https://ponafet.ru/wix?keyword=webelos+game+design+worksheet. This suggests the document is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=webelos+game+design+worksheet PDF link annotation
    • https://pitekolejemapux.weebly.com/uploads/1/3/1/4/131438362/xivoreguda_mojerof_tazubawe.pdfIn PDF document text
    • https://dutukoviwu.weebly.com/uploads/1/3/0/8/130873875/boxiloz.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/voxufin-juwugisoxonom-relabek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_6038f0cb5e964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_601a17a82e25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477183/normal_60442122d122f.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/140836b1-df02-4af8-b71e-335621337c0c/69775380053.pdfIn PDF document text
    • http://favukimasinete.rf.gd/aptitude_test_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fae3840-09e4-46ea-909d-d6c26dff0619/how_to_use_a_watch_tachymeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c627421c-b810-462d-bf40-f847c0e4bbb1/chinese_characters_to_pinyin_with_tone_marks.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_3c5ee2d8ebe546e6b00c0f54fdcb9e47.pdf?index=trueIn PDF document text
    • http://rowesotinik.rf.gd/data_analysis_in_spss_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531b0695-953f-4d2f-94f0-f0115c8a9b8d/what_is_r_gas_constant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc61074-6f8f-4495-81f1-a3ead43c3daf/lesaxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4f7f9c-3814-4a1d-a88e-5ada5b5316dc/55237026493.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_b18bd8004c14479d9b0ed5c1e99d31bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d09ae9-b1a0-42d9-9696-6bae26033dfc/vazigiloxuwulujesu.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_468081d41b374406826cb91b1fbec678.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fc6ca8-64b6-46f7-ba5f-75de95cc048b/59427142359.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_22851eabd1df432ea4c73d3f1cfac66e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 5548 bytes
SHA-256: f86b4651dc91257b3023f15793d457787f0f5556312a87a91435e6a970d0ec7e
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10992 bytes
SHA-256: dda083626e524963ac0e99f58f8705b9dceaef4de843160935a78016a6259aa4