Malicious PDF — malware analysis report

Static analysis result for SHA-256 93028c6948c482a7…

MALICIOUS

PDF

95.0 KB Created: 2021-03-25 02:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1ee6d69eb38b8c45a30532cd7a8a5ea2 SHA-1: d4145c1c6fd49afb2951704b5602d1dbc50bd450 SHA-256: 93028c6948c482a7c86d35eb6255880feeb8c279df64fe278c2c520c25086026
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'dugedepap.ru'. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF's primary purpose is to host a large number of links, potentially to distribute malware or engage in SEO manipulation. The presence of multiple external links and the overall structure point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=characteristics+of+a+christian+husband PDF link annotation
    • http://daimontimur.org/81172790102ohque.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426547/normal_5ffc9b6d230a4.pdfIn PDF document text
    • http://natorg.space/bamboo_style_paper_platesuib8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_60464add8abd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_605b8cffd20c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_605070bb57509.pdfIn PDF document text
    • http://ligorowimilupux.22web.org/brisbane_tv_guide_android_app.pdfIn PDF document text
    • http://winclean-shop.space/kugiraxejamulovejurhtvj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5ffeeeb28756c.pdfIn PDF document text
    • http://noseparelal.iblogger.org/centella_asiatica_monograph.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/6bfb2894-7413-456b-b7df-39199ba39729/1797000652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2809cbc-0762-47f2-b068-79f5bc40eb03/how_to_be_an_art_therapist_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49871b9-7406-4a87-8de9-278192b98735/dunefalovexugomorexodep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca2044f-74a0-45a7-80ca-2e4797d6e56b/56870297526.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_c1ad8443d900464a84190f62d45d5ac9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f6bfe5-9b34-4cdf-b196-e77403e881dd/56657046232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709a868a-11be-4228-9eab-f1803783c260/saviwixim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129a1eff-53b6-41f2-ad90-5f3ffb5722c6/71784888655.pdfIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_19c58d245fac4c2fab8a5de7f25ae3dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a16ede-16e9-4999-abdc-ef21a01103ac/48553155168.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/fuwegenorugivobo.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_e4711d382a5a4eb1ac8a0e706de0e6c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/853f0277-5044-4fa7-9d14-8a56fb2876be/vofodekitaxewu.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_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 5120 bytes
SHA-256: 4c74d0352eb457c1b7928b56193f75bd4a4589e2da2bc69043fef23d634f0c5c
font_01_sfnt_off0001482c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482C 10912 bytes
SHA-256: bafcbed8e01d159d710c1ea05bbc97c4832b3fd45c4b035a5dfcc020a7528370

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