Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7828207c5f24c00…

MALICIOUS

PDF

72.9 KB Created: 2021-03-05 09:38:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b15d1ae9159e85877463c27343d420 SHA-1: d90d602cbceee617f444601e357d1636b154d4bc SHA-256: f7828207c5f24c003959e6d06faac722705d638238c6f2bc4d82be3b6bb62623
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, 'https://lozipotod.ru/wix?keyword=cowboy+cha+cha', is flagged as suspicious. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest an attempt to manipulate search engine results or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://lozipotod.ru/wix?keyword=cowboy+cha+cha
    • http://lunatan.medianewsonline.com/how_a_bill_becomes_a_law_philippines.pdf
    • https://cdn-cms.f-static.net/uploads/4459792/normal_60134d7c1ed68.pdf
    • http://tepugorotewole.medianewsonline.com/samsung_series_6_55_inch_smart_tv_specs.pdf
    • http://kadanijojabuf.mywebcommunity.org/significance_of_bollinger_band.pdf
    • http://shoop-ft.ru/852852487630xmx2.pdf
    • http://wogivodugakovek.mygamesonline.org/ipod_mini_watch_case.pdf
    • http://es50off.pro/mewuso2wlml.pdf
    • https://jokiwuruxuwam.weebly.com/uploads/1/3/1/4/131437523/5340657.pdf
    • https://wirazalalotun.weebly.com/uploads/1/3/0/7/130776536/8304241.pdf
    • https://cdn-cms.f-static.net/uploads/4427295/normal_601ca915e9819.pdf
    • https://cdn-cms.f-static.net/uploads/4374540/normal_6021964b161c2.pdf
    • http://zuregazezoral.mygamesonline.org/easy_smoothie_recipes_with_yogurt_and_fresh_fruit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fupanabivote/ignou_assignment_solved_paper.pdf
    • https://s3.amazonaws.com/wupixufekijax/4x4_oll_algorithms.pdf
    • https://s3.amazonaws.com/zosevid/kufokaxoru.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/7th_grade_math_minutes_answer_key.pdf
    • https://s3.amazonaws.com/pusori/49026137684.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/assassin_s_creed_apk_gameloft.pdf
    • https://s3.amazonaws.com/wejuvono/angular_7_forms_module.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d9.bin
e2e6235387ee0b834f04674914e0e71455836e4a61efa7f0e9fbfadad0ecc76e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 4820 bytes
font_01_sfnt_off0000f359.bin
0e1b554c905a56415a16798629dbaaf2bbec0c315a273f48cc3d5a2e204b5e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 10184 bytes