Malicious PDF — malware analysis report

Static analysis result for SHA-256 91169744ed2ec8f8…

MALICIOUS

PDF

75.7 KB Created: 2021-03-22 06:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ddccb9f24c543a5bcc9ef215e68556d1 SHA-1: 0405ac37130fb7c353f1ce24275a5707e1ee63d7 SHA-256: 91169744ed2ec8f80fce69448358f86edff012b6b97acd9ccf59b6a161d03d8d
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of malicious URLs and the document's structure suggest it is designed to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=sample+introduction+letter+to+board+of+directors In PDF document text
    • http://guitar.su/modeling_agency_company_profileuzjcv.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/tecnologia_assistiva_para_deficientes_visuais.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/9555594.pdfIn PDF document text
    • http://p-kavkaza.ru/how_to_lose_weight_eating_fast_foodq1c56.pdfIn PDF document text
    • http://bonifacy.site/kfc_allergen_guide_ukxi08u.pdfIn PDF document text
    • https://wokiliga.weebly.com/uploads/1/3/0/8/130814475/4eec2fab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/xewudebuxiwe.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_59434984aa754f33b9711eb04a467e08.pdf?index=trueIn PDF document text
    • http://kikanelomer.onlinewebshop.net/zayn_malik_book_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/zewetipokuf.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/structure_of_human_brain.pdfIn PDF document text
    • http://demuremapinob.epizy.com/ragiji.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_69f2f8740ee04470af4c2e4d754a1701.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/pisodutisebidun.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_d5019c0d1cf04116a30205f5bdc96a41.pdf?index=trueIn PDF document text
    • http://navizabopa.rf.gd/45881642085.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5544 bytes
SHA-256: 6309b63ac63f52170cdc731be5a604cb36cfa70544d9986f4d9e0fc82ca122c9
font_01_sfnt_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 10780 bytes
SHA-256: ad3f005e87299966af27b53114188e8ef2b30656f2afb323b9889aea76486889

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