Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eda1cf69962674…

MALICIOUS

PDF

74.6 KB Created: 2021-05-29 17:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fc29abbb254cb2f06597df004bb2d9a4 SHA-1: 5e4e77a8dbc686863c55da1d5985fbe47b4cf75a SHA-256: 66eda1cf699626743fc0633583d3f6aa80638b8158f8a84bb4dd33e33cb5a653
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam operation. The embedded document body text suggests a lure related to a popular SQL book, likely to attract clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://botokaw.ru/strik?utm_term=sams+teach+yourself+sql+in+10+minutes+by+ben+forta+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415327/normal_603f41c6b41dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_60582e32c8b88.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4493550/normal_60b136fc964b3.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/wetoxiwapatogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5ff1c8f3d44c6.pdfIn PDF document text
    • https://duxegolukazokun.weebly.com/uploads/1/3/1/3/131398215/bfbc1362ec08fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_5fd9536a70386.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/49a2fc0.pdfIn PDF document text
    • https://rukawaxosudeda.weebly.com/uploads/1/3/4/3/134308265/busete.pdfIn PDF document text
    • https://mutefalififide.weebly.com/uploads/1/3/1/3/131383766/8468488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_600f315d8c1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fe748ee3b094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_5fe8d121357c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_606e7a3aa3a96.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/1b323c73-729a-4c7a-9263-74fde7c8364c/wilson_combat_beretta_92_trigger_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f0365b-aa10-4c99-b752-9b6fdbabfc5c/what_are_mechanical_engineer_duties_and_responsibilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b366076-e5fc-430c-8dc8-179d5916922a/can_apple_tv_remote_control_sound_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4257d2d-119f-4d6b-93d5-8f7d65e03662/nadomanizidujapifezaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934a8939-c172-4e03-8ba5-90fd6ede3fe3/leggett_and_platt_adjustable_base_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286a0c10-c525-4e52-8f7a-b0287f6c51a5/difference_between_mini_and_standard_dachshunds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67514a2a-9f26-4e94-9e28-98b151d297bd/oraciones_en_ingles_con_verbos_regulares_en_pasado_y_presente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3aa9ae8-10fa-44c3-94dd-c268a55b9afc/99715235142.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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 6060 bytes
SHA-256: fc9cf396dcc3b474221817621ae1060e2a506bb0db37b62a0cbf1aa6986b1484
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 11304 bytes
SHA-256: bd8f142d8ad52f0eeb60384dac9f18154d578284fd7764a47b4e3c8be6ace21b