Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad81ede521c6535…

MALICIOUS

PDF

101.6 KB Created: 2021-06-06 04:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 90a7fe10cad734aa55cd18a8f35be012 SHA-1: a9b378a7eb3e905835b8ef638e27b0b457b5c49e SHA-256: 5ad81ede521c65355107cabf6b6687bc91f9d23c7b3a40ba4e711f05ed75d891
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://maypoin.ru/123?utm_term=balance+chemical+equations+worksheet+easy PDF link annotation
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/nibadutapawov.pdfIn PDF document text
    • https://perufagumitaxa.weebly.com/uploads/1/3/0/7/130738779/fuberenigos.pdfIn PDF document text
    • https://moxujudafetofa.weebly.com/uploads/1/3/2/7/132712376/6906176.pdfIn PDF document text
    • https://jibeguviju.weebly.com/uploads/1/3/4/7/134723477/d28122b.pdfIn PDF document text
    • https://gavibokilixebil.weebly.com/uploads/1/3/4/7/134716725/garibesinos.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/tozagaxaja-fupobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_60588d5c35506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_5fd8bcba41894.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/woxabisi.pdfIn PDF document text
    • https://bajazari.weebly.com/uploads/1/3/4/3/134314741/3427318.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455179/normal_60affd4717286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418180/normal_5ff5298248cde.pdfIn PDF document text
    • https://gedolumu.weebly.com/uploads/1/3/4/7/134761272/5722f786.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/1309865.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/xetokejujebodorel.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://mefijunov.pbworks.com/w/file/fetch/144421125/can_we_convert_2d_to_3d_in_autocad.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/cdc_covid-19_screening_questions_to_ask_employees.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426261/angular_custom_form_control_ngmodel.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144577362/gemidibaraxonijenobunel.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/is_tracfone_iphone_unlocked.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/w/file/fetch/144498804/75362799037.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144540570/32338421961.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/download_lagu_pantera_walk_mp3.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/f/fozup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CF 2828 bytes
SHA-256: 3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
font_01_sfnt_off000142ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CA 5356 bytes
SHA-256: f6ccbd25e5b065f530d802c6eb6ec0c6e72c8e678a3dda7c9698505703c9a569
font_02_sfnt_off000154de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DE 10160 bytes
SHA-256: edad8c388e38a4456ba00157c0ff0bf34e6be5ba9b8f0e2a2008c5827042b94b
font_03_sfnt_off0001776a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1776A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230