Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c277403bcdd426…

MALICIOUS

PDF

80.1 KB Created: 2021-05-16 06:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bdbdb7ea63ab735199ccdde19c9e1b74 SHA-1: d836e01fa872aa65b20fdb2678f959d61ae4ec43 SHA-256: 95c277403bcdd426c41d594db45e95efee5485842dc079c5f48e2a1b9945b1aa
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=what+is+counting+by+7s+about PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5fcb2e4f3446c.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/5755592.pdfIn PDF document text
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/temopagugofemodosug.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/lCCSkIu/free_az_beneficiary_deed_form.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/QicjcVU/17826404642.pdfIn PDF document text
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/6766014.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/d0ehiib/space_armor_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5ffb842ebe7b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_02fc5bf9ba67419b892ca4a2162242e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b97f239-2fd8-4bea-893f-021947edb33c/50_shades_of_grey_series_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595846f8-f1b3-48b6-aa85-1a3885ee8e86/steelseries_arctis_3_compatible_with_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f672c037-1a85-47f9-93db-2900161001cc/how_to_clean_inside_glass_door_of_wolf_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b9373b-2aaa-4a44-b678-9405ffe27be5/rosetinugap.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_25740512e2c2402bae9df6d13f4f77d9.pdf?index=trueIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_c2708be69f864a01a9747a43a2874b78.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_df2e4c68edc44a248bf7854f327a6fea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a938cf-5920-4497-b986-d5c299453b9b/64489541559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4475b3ce-18a7-47ff-9c58-47854735c67b/the_juliette_society_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3a755a-e2af-4d33-87e6-49c7d242c0d4/2230388295.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_431c95c575454a7abec0997f37c63960.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/991119c6-80f7-435d-a1db-ed4f2fa3f2cb/sigisobejebilopema.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5032 bytes
SHA-256: a0cf26a319bf4165c5b1534689ac50151a91d25f861bb80aa0ab3ce92e9050ac
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10864 bytes
SHA-256: 4f613a1ff9656fa4d5c304065031e5f84c6b3b870a7cd1d9101035fb30183e7c
font_02_sfnt_off00012584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176