Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96bf21582a75e1c…

MALICIOUS

PDF

88.4 KB Created: 2021-03-15 01:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c9e273d9e5ba484d1c96a68ef5d796a SHA-1: d8284661d139098568a17c833c7fd75b82bcd3d8 SHA-256: e96bf21582a75e1c3c94320327381bab6c0112a29a1b9e0b2650805baebf5d2a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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
  • 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://gimoguvi.ru/strik?utm_term=index+imperium+2+pdf+vk PDF link annotation
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/jifawerifexiw.pdfIn PDF document text
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/c5318e3a426846.pdfIn PDF document text
    • http://raxuzogigegekaj.66ghz.com/blood_clotting_process.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/gcggjg9/36337773068.pdfIn PDF document text
    • https://tatosexu.weebly.com/uploads/1/3/0/9/130969313/belewarewuni-basudufezobopi.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/how_to_open_casio_fx-9750gii_calculator_box.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/legifoxi.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/gavasem.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/1gSieib/18868149683.pdfIn PDF document text
    • http://lufijep.iblogger.org/airways_management.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/c60be891415b8.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/M9biai8/depreciation_sheet_as_per_companies_act.pdfIn PDF document text
    • http://nekalakizifefe.22web.org/tifoburidetemapukovup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_2d34b8293b3a4a609c82d7f89807fc95.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_6d90303c7ab34318bbb810d442d4fd82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df8d909-d3ab-423b-850e-beefa8b13e4f/35651049320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40402858-cfc8-4d15-a4ff-5808a415d553/democracy_and_education_booker_t_washington.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60344746-af20-48c3-9a57-7de68a820bcb/is_newsmax_available_on_the_radio.pdfIn PDF document text
    • http://zivobojunoloma.epizy.com/the_effects_of_media_violence_exposure_on_criminal_aggression_a_meta-analysis.pdfIn PDF document text
    • http://finubovuputok.epizy.com/biomet_radial_head_replacement_technique_guide.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_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 5028 bytes
SHA-256: 3f16f3575bfbb9eed5a44ff48d8e30bb3e41e8d65ca7b4a3e2dac9f2cd60062b
font_01_sfnt_off00012e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 11232 bytes
SHA-256: 638c2ba049e409872f49b9892ec98a5e2f82cbfa1593c4da94a7fcec75e8a800