Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7637ac582fdb48…

MALICIOUS

PDF

73.6 KB Created: 2021-05-15 01:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b02aa7b215ed7ae4514626590620350 SHA-1: 821ba915c0cb72d1c0bc1ee56790d43277e71fd8 SHA-256: 5a7637ac582fdb4890c77c7f0e19d3fc363f08d08e17c84064c7e8debfde05cc
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, appears to be a lure related to a search query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+much+does+a+john+deere+9rx+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412154/normal_6047aa0e15647.pdfIn PDF document text
    • https://selikiwomutarew.weebly.com/uploads/1/3/5/3/135329437/guxupudatozed_nalavivigowedes.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/spss_statistical_software_free_windows_10.pdfIn PDF document text
    • https://xilaperuzu.weebly.com/uploads/1/3/4/3/134362480/jezaxulo.pdfIn PDF document text
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/3881877.pdfIn PDF document text
    • https://gomejewenikugi.weebly.com/uploads/1/3/4/8/134869664/7597715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5feb7c05b66be.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/vunizi/linear_equations_with_fractions_worksheet_kuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27adf352-0ad5-431c-996f-2bb6c4a175f6/dell_inspiron_3520_laptop_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910d5fb8-ee91-4169-b5b2-f19ed4f81106/gafewarer.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_3b24c7a696f6418faab86f001623bd2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/padilogawatuvuvidur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978a7552-e386-417a-b72b-f0626ab20519/2730510803.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_662dbea3bad242edafaff34bcd14f073.pdf?index=trueIn PDF document text
    • http://xizuzaziz.rf.gd/worksheet_for_finite_and_nonfinite_verbs.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_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 5500 bytes
SHA-256: 8857f7dd586782de41d76182141766446aa05eb1f88b6d5856b6de4b0b782619
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10824 bytes
SHA-256: 2cfe6a642a83925d4ac343323e8a6100aef767ec8399cb877111b0c9a3c8771b

Open this report in the interactive analyzer, or submit your own file for analysis.