Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ed71d3e765a9b3…

MALICIOUS

PDF

84.6 KB Created: 2021-03-06 10:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fd2c7b84d318fe34172104eafcb341a9 SHA-1: ac12c7269ebea19e73a6db1ea7cff86177716f55 SHA-256: f7ed71d3e765a9b39d4a6610ea40f35e5245a2ea46bc73f261b82f6ba0a9121e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and one specifically to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body itself is largely unreadable, but the presence of numerous external links suggests a tactic to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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/123?utm_term=how+a+hydrostatic+transmission+works In PDF document text
    • http://gadetebes.sportsontheweb.net/logitech_wireless_combo_mk320_drivers.pdfIn PDF document text
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/vigivabi_davabe_voxabaruvepe.pdfIn PDF document text
    • https://wasaxedunup.weebly.com/uploads/1/3/1/4/131453111/671126e6be56067.pdfIn PDF document text
    • https://ranatugirebulox.weebly.com/uploads/1/3/4/0/134017659/metuwajajexetiv_riwipakuleja.pdfIn PDF document text
    • https://kibewuzogoluwiw.weebly.com/uploads/1/3/1/6/131636689/8a43667.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/voluxeran_derisomubawabo.pdfIn PDF document text
    • https://kagopibuxewiki.weebly.com/uploads/1/3/1/3/131398156/wejosirapaki_vuxafokefovubam_xuvavapav.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/napoz.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/85992659591.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/pujagev.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/dcda665a-071a-43ce-9295-ba001a4495d4/25636102379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9d3adc-7a96-416b-93ec-3b2ffbf31dcf/pinosovibinuxelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b380d9-72fd-491b-9933-d72eaf92394f/tevekazipideriwalutokubid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0eaa073-d190-43b5-9ec4-e332e9eb1ca6/motivational_interviewing_online_training_free_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ceced0-091e-4ec9-90f1-3d79270dc3b6/28067393142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af22e61-76b6-444b-988e-11c17f49f0f6/radiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a108bb3b-6a1f-4cda-8369-1eea67975cf3/fujenebimuboxijakigiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4c38b5-ecb8-455c-ade1-6f6f5a36bda6/the_boy_in_striped_pajamas_summary_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07098285-2a1b-4d2a-a56f-4c56a9d24939/sutidufevodefigepenuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d03d6d8-7a19-4826-960b-5f729324a1c4/638933318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee27113-3a0a-49a1-9422-63e42a75275a/lunijanidesusuwikolim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf6e30e-c583-44dd-8616-2268b71d51b4/82230391947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94561fc-3885-4eb5-aaff-8898374b2d62/campark_t45a_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7eb715-00e3-4257-a1dc-acf774e0102f/45390579339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9949fdd5-0ed6-4aa6-a1a8-5a9652aa5713/mefagowu.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_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 5368 bytes
SHA-256: cc04e6c76fa6fd1684e2649bd7b9d31208c5a4b1f9c6b386709aa74e5e1a1407
font_01_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 10596 bytes
SHA-256: 0a661994bde7ab006a3dee6b62cfe501c283727de53fa584a23b3e926546c87d

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