Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc80a46096dbdc50…

MALICIOUS

PDF

72.3 KB Created: 2021-03-19 07:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f849fc5a618804d4d9fdc4c417544a3e SHA-1: 2868a7119bae1215ffddbd033476f2013c104d24 SHA-256: fc80a46096dbdc50b29dcdf9bc72c39ef6e0f6be3e5032b5c37e3e1a197ae685
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded document body, though heavily obfuscated, contains text related to diabetes and a tool name, suggesting a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://leonvi.ru/strik?utm_term=what%2527s+a+good+a1c+for+a+type+2+diabetes PDF link annotation
    • http://eroganoficial.site/internet_manager_keys_20192pb4f.pdfIn PDF document text
    • https://mavevataxivira.weebly.com/uploads/1/3/4/6/134600118/8731682.pdfIn PDF document text
    • https://jinumajot.weebly.com/uploads/1/3/1/4/131409926/logaze.pdfIn PDF document text
    • https://nodazijokavi.weebly.com/uploads/1/3/4/3/134315007/rimejevik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_60192c03d62ac.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/1455528.pdfIn PDF document text
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/0f092ebc.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/chggejc/10431623843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_60276448b4466.pdfIn PDF document text
    • https://wedodoto.weebly.com/uploads/1/3/5/9/135993452/romaw_ropubogarasa_logorivizijafe_vixip.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/hTUZHHV/21176892797.pdfIn PDF document text
    • http://bottlechainworld.com/mokuvexuke6ikbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_60430a1ecf54b.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/7635378.pdfIn PDF document text
    • http://datingsexchat.site/rational_numbers_worksheet_7th_gradehnfo9.pdfIn PDF document text
    • https://suxozunepewax.weebly.com/uploads/1/3/2/8/132814427/pavevirifuvezel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_6001740eb840e.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/PN9hchd/xivovifovetajedubesu.pdfIn PDF document text
    • https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/xuvubag.pdfIn PDF document text
    • http://imkl-checker.com/pakerex51f0d.pdfIn PDF document text
    • http://lnstagram-helping.live/dead_until_dark_bubbau3msx.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/c7eaa54605d92.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/iMVLjaq/15687256644.pdfIn PDF document text
    • https://cdn.sqhk.co/koroxofusino/jghiqTH/48584383661.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_86d0233033a44bd98fc9fe60483cd468.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_6ba0389d9a994b3aa51caca605034288.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_2389f987adad4a0ebae25f9f3a62e7fa.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_374f6d4a52be43d386033bab969141a5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 5860 bytes
SHA-256: f4366da2c5c10ae7964a5677e947c6631bdc769bf6b869158b67cdf4c594aa6c
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 11604 bytes
SHA-256: 6940cede1ef215d6dabec2118c928b0bcd5d42d6561106a1ba20fc45d9c0213c