Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c39fcd528612bd8…

MALICIOUS

PDF

80.2 KB Created: 2021-04-14 15:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a6471091e71a10e2204c5b4f3b90e6c0 SHA-1: 25c55ecf5aee955582e94690c11fedd50cf9b027 SHA-256: 9c39fcd528612bd8826e3dbdd3ebc2bdffc741cfab3b595bc0fc2425a4075a66
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, identified as a link farm. The primary URL, 'https://dugedepap.ru/strik?utm_term=the+collector+3+reddit', suggests a potential phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the structure strongly suggests it's a lure to external 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
  • 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://dugedepap.ru/strik?utm_term=the+collector+3+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461219/normal_6061b4755d0e9.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/ca8150cfdf4d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5feb2e12909ba.pdfIn PDF document text
    • http://edaeda.moscow/deguruihdhj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5fe7940ad9871.pdfIn PDF document text
    • https://godosofebi.weebly.com/uploads/1/3/4/6/134651625/e15917b98e274f4.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/8688006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393635/normal_5ff594c263e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_601f8416c454f.pdfIn PDF document text
    • http://verifybadgehelp.com/shark_vac_and_steam_replacement_partsoi7as.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/16bef4f1-e248-4d79-ae3b-15175fb91139/25520077646.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_ab21a6c6a6a746049e41dbed9d2a6023.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b665fa-c38a-4b46-b1f0-012bafc7522d/analisis_filosofico_de_la_pelicula_el_seor_de_las_moscas.pdfIn PDF document text
    • http://pifutujotot.epizy.com/junesefup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88df91c-738e-45c6-b3a7-6a4a1c43d2a9/2016_form_1040_instructions_tax_table.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/xasobovimopivadato.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_419a255534724bd9adb956239a305fbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0deecb2-2bea-44a2-97fb-5bccb76b3c43/xiwififezinotavovani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55b7dac-8cf8-494c-a791-6ce5e896fe97/7596104265.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_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 4752 bytes
SHA-256: 706560df28b52b641f746386f792a12a78b10a0aace0ea49f2f8c1f42a6f001c
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 11276 bytes
SHA-256: a3a64c2184f4f2cf16616f717e587802f0c4750c979328c4e66c044151cff486