Malicious PDF — malware analysis report

Static analysis result for SHA-256 978d012e0ec14dd7…

MALICIOUS

PDF

88.7 KB Created: 2021-04-03 16:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fe65c4f35ae9a729fd7fa6e8fe88d742 SHA-1: c15ac79b66b3d23e0ed96d7867dae7966d3ef164 SHA-256: 978d012e0ec14dd781ac578755e7fa354007f6e877fccd7d4c0e4ed5f0313aac
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, "https://midufefew.ru/wix?keyword=chapter+11+wordwise+answers", is presented as a lure for educational content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious or phishing sites.

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://midufefew.ru/wix?keyword=chapter+11+wordwise+answers PDF link annotation
    • http://zunuwapinab.iblogger.org/68141397964.pdfIn PDF document text
    • https://webesamogamafi.weebly.com/uploads/1/3/4/0/134012635/jipawerosuvi_fepoliz_zetexole.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/kinekisalatal.pdfIn PDF document text
    • http://muvirire.22web.org/124690942.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/8b00e87933853e.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/fLBhfLN/19026657204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_6042e7648314c.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/zgggicv/20203788064.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/geOojdG/24045170625.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/hiijghw/zetidideweroma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5fd11749f05dd.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/how_to_apply_car_stickers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_60359ada71aef.pdfIn PDF document text
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/wajupage-suvumijijawajun.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/4f6bcd5d-4fa4-4d90-82c1-6f1914fff9b7/dosenusejifoximaxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefe5eb2-8fc9-4934-805f-6f6f58d790ed/enthalpy_change_definition_aqa_a_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df26261-39a2-408e-8c6f-d2c54aec3441/shimano_di2_problems_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17fbc7a-57dc-4eb7-a0d9-d7a6863ab849/tolutemekewoveru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e6df59-6056-48cb-b20c-93facfa5941a/94674158553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129935a5-2630-4eef-8f23-be672021e077/45764336624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f888261-f0bb-4ebe-af05-0f4e073adbce/93737196917.pdfIn PDF document text
    • http://tawaxinazaka.rf.gd/lafuketupil.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_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 5064 bytes
SHA-256: 99357ec6de548235a84a28690029f5be5a602e7752b34115604b941e17965253
font_01_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 12528 bytes
SHA-256: f53c632a650643d7815e8f348925d5f0b1d617c42021c641bceb7b0033d2c7b8