Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a6639f29dd14b3…

MALICIOUS

PDF

69.1 KB Created: 2021-05-16 03:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fbdfe9dc43ba312ca265605f86a8d139 SHA-1: 958183cf6f0296ff3d9755427616014f385b9660 SHA-256: b3a6639f29dd14b37042fbf5abd41e91c61f6c66be84e76abbd2de17f2412556
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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=microsoft+word+2013+download+for+pc+free PDF link annotation
    • http://tesapewuj.22web.org/temario_auxilio_judicial_adams_gratis.pdfIn PDF document text
    • https://kikokemez.weebly.com/uploads/1/3/5/3/135331375/1384910.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/nuzawuwopab.pdfIn PDF document text
    • http://foxeletumirud.iblogger.org/42693822918.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/vozagiwikedagaxeron.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/26cdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_edec7878f37e43be803a3e44a55e8131.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/714e4041-ebba-483a-b52f-65a53d05acd8/fopegekamifil.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/piriformis_syndrome_treatment_runner.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_421288acd286440ab178acbbda325a6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5604064c-04bf-4db2-b8e2-0e5cd57c658d/dumutulefogux.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_bd43ee368a9747c68e13bf022ef30d85.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_352c621561dc4e6e8663c7fc12f671a2.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_fd17c8c7693a484d90fc99d890e8c2c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuboki/how_to_cook_a_turkey_in_a_char_broil_big_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/1557982984.pdfIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_3c3b86c5086d4104abd19a7ba4dc4258.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/hp_officejet_7612_wide_format_e-all-in-one_printer_price.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_d5c01a423e594539b97fe3e82fe9e953.pdf?index=trueIn 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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 5736 bytes
SHA-256: 73a508e7561de419dd680530763e7c8293bd9ea6b2365e1d98ffd4e80420cde3
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10560 bytes
SHA-256: 628badf59705e429e1275fa58816b06f36f115f1c2b680e91d1f43336101d69e

Open this report in the interactive analyzer, or submit your own file for analysis.