Malicious PDF — malware analysis report

Static analysis result for SHA-256 347f77e86fa67898…

MALICIOUS

PDF

75.8 KB Created: 2021-02-26 12:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7307035c77c065f95626dd65329101ef SHA-1: 22a40aed617b8bc444029dd30d4f2d489ffc61d5 SHA-256: 347f77e86fa67898e5af53dd73173250f147c6ba95dd4eaa72ad71815f44ca0e
206 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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document impersonates a signing service, a common lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://gimoguvi.ru/123?utm_term=how+to+download+acrobat+pro+dc+helpx PDF link annotation
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/d80a31.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/discrete_mathematical_structures_4th_edition.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/wowesukox.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/1791810.pdfIn PDF document text
    • https://tokajufifed.weebly.com/uploads/1/3/0/7/130775528/zoxutomefen_ruxagubukir_tulazedirep.pdfIn PDF document text
    • http://boomerangoo.site/fanoxamaxobobutup2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_603576a9361e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461481/normal_5fc810e076819.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/yamaha_majesty_250_user_manualgcgov.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/jemuzexadomazo_vowumerigen_gunof.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/nujuvimelasolapojebi.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/1638389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_6007fc6934ac9.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/zinorozusowamol-vijom-netelaresu-rivoribaloloj.pdfIn PDF document text
    • http://oneshops.space/1332733298dnyje.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/93beae139a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_6015f1e35bb6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujidafedisezu.atwebpages.com/lewevezoj.pdfIn PDF document text
    • http://bitines.myartsonline.com/26206216146.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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5244 bytes
SHA-256: be7624caf7c04a82cd51dc2665b4f56b5a6521117ab971e64c10e548a025f059
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 11200 bytes
SHA-256: 4b174152b3c8116412456c2649068993a23697da53b19e9e8158c69ea9f193c5

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