Malicious PDF — malware analysis report

Static analysis result for SHA-256 c499fa22751a684d…

MALICIOUS

PDF

82.0 KB Created: 2021-03-24 21:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 21afe0c7eef0b0eec9492403d0853e46 SHA-1: c6060549baba5a1a05eeecb3912f7272f3ee326d SHA-256: c499fa22751a684d45b8493f3b4ae0a2889854c14b8158154c2a686427328463
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no explicit script was found, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=being+the+wiser PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386094/normal_6000c330ecf27.pdfIn PDF document text
    • https://rowigoto.weebly.com/uploads/1/3/0/8/130813427/wuporexebuwulekami.pdfIn PDF document text
    • https://sokikafumuwo.weebly.com/uploads/1/3/4/6/134697409/21ca95.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/1652839.pdfIn PDF document text
    • https://golinogejus.weebly.com/uploads/1/3/1/6/131606227/zogodojuvedevo.pdfIn PDF document text
    • https://devaropig.weebly.com/uploads/1/3/4/6/134616199/kopusoj.pdfIn PDF document text
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/8702581.pdfIn PDF document text
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/99998f6dc66de91.pdfIn PDF document text
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/mukurigofexazal-gikojo-sizotixivi.pdfIn PDF document text
    • https://bamesejoporafuv.weebly.com/uploads/1/3/4/2/134265360/8154097.pdfIn PDF document text
    • https://bobejezesolaz.weebly.com/uploads/1/3/4/6/134622741/32c65a36d.pdfIn PDF document text
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/towetonup.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/b3183b9.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/migelotumas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456119/normal_5fe2db4bbce6c.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/70f91bb.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://uploads.strikinglycdn.com/files/8944425a-5724-4946-b31e-58d2d0a53daa/backpack_literature_6th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c5d732-0e06-4fa6-a2a5-b96ac90a2008/book_review_template_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25bfd41b-d59a-4ef3-a24c-55aae1fd8bc1/brown_versus_board_of_education_def.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92c7927-1cec-4483-a865-22c7dab60734/is_dork_diaries_a_novel.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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 4524 bytes
SHA-256: 93653cb79a4921cb6ed9aed0bf525fb46c68ed7c103f971ad90a2d7e5d7c1b44
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 14808 bytes
SHA-256: 4d9df208620a2eeb1e0896a89e57118465ac28a2c9e834da0457de325f6ece29
font_02_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333