Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a68515a71a2ac96…

MALICIOUS

PDF

76.7 KB Created: 2021-05-29 19:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: acd0ca412cc0271a00e67f56de4ede7b SHA-1: 4b380bae2fa3b023d064e586feff1e6cc3defaa5 SHA-256: 8a68515a71a2ac96f607c094a4507ae5e44b1f1b9c5c038d9ad06795c19fc50c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself, combined with the 'unknown_exploit_score', points towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nipisod.ru/strik?utm_term=zubeen+garg+new+assamese+song+2021 PDF link annotation
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/8067093.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/17826bc9e883d3e.pdfIn PDF document text
    • https://disakenukewawo.weebly.com/uploads/1/3/1/3/131383770/fogura_luvij_kimunitagekodil_wozazu.pdfIn PDF document text
    • https://wozexapumodokeb.weebly.com/uploads/1/3/0/7/130738903/7880709.pdfIn PDF document text
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/gezudolen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_603877ab5c80a.pdfIn PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/1238451.pdfIn PDF document text
    • https://gimegeje.weebly.com/uploads/1/3/0/8/130873822/koxevoponavada-nofep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_6046ceda49989.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/jatibeso.pdfIn PDF document text
    • https://fixugosotodig.weebly.com/uploads/1/3/7/5/137518485/650504.pdfIn PDF document text
    • https://nuxolabebaloxuf.weebly.com/uploads/1/3/5/3/135326303/4f39ab99e7b9faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd8154bc7be2.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/9124437.pdfIn PDF document text
    • https://fizilotot.weebly.com/uploads/1/3/6/0/136050642/nipijefafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_5fea3b628f00d.pdfIn PDF document text
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/f91b19095be01.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/964f8740-a54d-4b9c-82da-146928006670/zetuzavoterafajaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcdb71e-8787-4652-9b85-688df9e77940/82633505495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b883924-2198-47f6-8ae1-e6c0fe291007/dizusekumozuxemusobeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc925f01-909c-401d-8375-46076c62135b/microsoft_windows_server_2012_end_of_support_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928d0572-0a7d-4758-a954-e6178ba711e6/gorezakozeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859055dd-9fd4-4d23-ba04-77b971c20f37/39257456603.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 5488 bytes
SHA-256: 8a2e3065e7af8c9ef8174c5e16a8b337fbf83d4f35459728bfd16bb6cb91e57a
font_01_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 3960 bytes
SHA-256: 5e2e0d06788ff7408a813698058316ae5b37d3deecf0da855a344ec570a0cb37
font_02_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 2480 bytes
SHA-256: 8c0142a1b2c6424cf79618e92d70fb6f78fc54ed57d9955515e3d3eb68ce6b7e
font_03_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10624 bytes
SHA-256: 7459f324114063355c0ee7c8561a195d250622f37e629167ab3788efeb6f5f49

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