Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08b61efbbf93826…

MALICIOUS

PDF

78.4 KB Created: 2021-05-21 20:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a67ac7f25a718f0f9e4c63b55ceb1b9f SHA-1: d3394684f82b9f8fb33452bd1ee6a9abd53d33f6 SHA-256: d08b61efbbf93826ed5f207432f42e28541c8056c894800cb9a09a640f371bf2
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely by directing users to external sites. No scripts were extracted, but the presence of numerous external links points to a common tactic of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=delonghi+magnifica+s+descale+light+won%2527t+go+off In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5fcf9d5fa1667.pdfIn PDF document text
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/jijuvarasazokom-xagiwev-dokomos.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/wivarodegaxu_rimivosawaf_vovasovaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fc7e91d4ac99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5fe77aee26f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_6067900901617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_6052230f9eee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_5fd81681e75c9.pdfIn PDF document text
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/fb61245a4545a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_60451231320e2.pdfIn PDF document text
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/gexezalewodukidab.pdfIn PDF document text
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/3a3bc2499cc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_605312806046f.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/00e8bdc2-faf3-4400-b99c-24492a51eaac/john_deere_x304_pto_clutch_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57075ef0-b893-432c-aa17-18d135d3820d/directv_genie_remote_not_working_with_samsung_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28f350b-032f-437a-b7dd-251c1e7874f2/easy_lunch_recipes_for_picky_eaters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdb8a72-ea5f-4892-82ad-6ebfc9f875a1/que_significa_un_lider_paternalista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/856531e3-0739-45d4-a215-c9324e18ab73/graphtec_cutting_plotter_ce5000-60_price_in_chennai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e144b6-b0ba-41a6-a1fa-9584379fc0c1/ratio_maths_worksheets_gcse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11d55af-6fa0-4662-b727-fee565ba1b13/nukinakakebusilavuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 5464 bytes
SHA-256: bf162ac1e3efb9b5533792684f9d31430b5b5ab1615a0ef15936e414a0cf5af1
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10660 bytes
SHA-256: 907c6dcc6328162e0e0671df1ce9f8110bd860f0e72f22c0ff0c7453ec89f9d5