Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ad3abe4c226b1e…

MALICIOUS

PDF

81.4 KB Created: 2021-03-05 12:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a71dfbf9fc93cda751cb285bf9a0c964 SHA-1: 91248e80df487cee843b0ad51a19566abc5afe2f SHA-256: 40ad3abe4c226b1ed50165f0eeab032e0cdc0484d9e5c66413ec365d08b856ec
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=martin+luther+king+jr+speech+purpose PDF link annotation
    • http://tulusujubige.mygamesonline.org/farazugok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_6005a0b79d194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_603e04c15ec6d.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/KhhhhB5/4fun_tv_frequency_hotbird_2019.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/semezabodiwamow.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/gugdjGG/gonaledofezibuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_5fd228123a913.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/polk_audio_soundbar_remote_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/dzzgfmo/clan_name_generator_pubg.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/77938529313.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/jcPcoib/63360106700.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/kumoka.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/xolukum.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/hhggjyu/90357227282.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/cVSgggf/samsung_internet_browser_vs_chrome.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/2258720.pdfIn PDF document text
    • http://zofugef.mypressonline.com/jupujega.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/K8xYjhy/war_machines_tank_game_for_pc.pdfIn PDF document text
    • https://juladugalevatib.weebly.com/uploads/1/3/4/3/134385664/2891821.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/icijghu/wheels_on_site_pittsburgh.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
    • 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_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 5220 bytes
SHA-256: beeebc3701b3a6d26c8763133394d8eb8b7cc98202090730fd9c553e040f206d
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 10240 bytes
SHA-256: 638ff69c92ea9b965aeb19f3a6b56ada16870fb2f630f1b74eadb08e5115a480
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230