Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de866f1b9cbadc1…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 19:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc04d123dc005cefa621e2f63e617a8d SHA-1: bb45a558f09de6e060c7b6c7c352df998102fb4d SHA-256: 9de866f1b9cbadc1bc77a20fae4d665076453cc6283128ce9725559525950c59
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, indicating a phishing or scam attempt. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest that the document's primary purpose is to redirect users to malicious or deceptive websites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://yafferge.ru/award?keyword=business+email+writing+phrases+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fe6a57968bcd.pdfIn PDF document text
    • http://doxisodezezaku.iblogger.org/44003758699.pdfIn PDF document text
    • https://simavaxefawok.weebly.com/uploads/1/3/4/6/134666246/gazimewoluzofe.pdfIn PDF document text
    • http://f1l3download.site/83760382674lxkcj.pdfIn PDF document text
    • http://pe50off.info/dugigafobuvugodezufimuta2dgl.pdfIn PDF document text
    • http://reetodo.online/the_confessions_of_st_augustine_audiobook4urfc.pdfIn PDF document text
    • https://ketoleva.weebly.com/uploads/1/3/4/6/134642234/mukopewafew_weruk_viwub_mamaveludu.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/razakorijoverur.pdfIn PDF document text
    • http://prizinsta.online/evenflo_chase_select_harnessed_booster_car_seatfp8co.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/h80gJaL/sad_video_status_share_chat_kannada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_604f026732dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_600d46e211425.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/czggieD/73555334396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ffdefe04f06c.pdfIn PDF document text
    • https://cdn.sqhk.co/fepefudasor/ahSwW39/crowder_jets_update.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_030b65d72dd94a60b4264b672a78c037.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_1ba527f212a2434abc8bfc6960b7f082.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_d0d420a7557d4e63a115e3d623dfa786.pdf?index=trueIn PDF document text
    • http://tunadexemuvaru.epizy.com/92023406396.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_45e7e369c1104f77ac6d155cf73653cd.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_8958c3f557494048b78566f3fe69757b.pdf?index=trueIn PDF document text
    • http://jazovojekil.rf.gd/4070655438.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_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5596 bytes
SHA-256: bbb66184ea0974ed9f3ecb4595361869726da04893cd24a8424e5ef676b2f4dd
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 10660 bytes
SHA-256: b9477bc99ac7a937c42c600987f468d8a9c5f55e852976391e980864268f8d5e