Malicious PDF — malware analysis report

Static analysis result for SHA-256 d195a7cb314612b9…

MALICIOUS

PDF

68.2 KB Created: 2020-12-15 19:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d4a3052317b84d183a7f8d61fe66c289 SHA-1: 20a751ce4df7068df95aa487a32239d323f52843 SHA-256: d195a7cb314612b99ba4d20683c8e6ba05a5518056408c6cc4f794c72010f5fe
294 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and SE_BRAND_CREDENTIAL_PHISH indicating a credential phishing attempt impersonating Gmail. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the phishing lure suggest the document's primary purpose is to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/wukijazu.pdf.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffmen.ru/strik?utm_term=deus+ex+human+revolution+boss+guide In PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/wukijazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fc89bfc2cbdf.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/68fe340a-54f1-4fe2-82c6-6a4189f0e208/gububobiwefepajanek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce6cf0c965c74ca3dfdf93/t/5fd032c4a4b4ef2db69dffd2/1607480005228/wovivojekesinif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc659b6116eb00e3c713032/t/5fcfcc1d3166556743ac785e/1607453732725/our_solar_system_is_located_in_what_galaxy.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/escuela_dominical_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10b71bdb33045eec31c8e/t/5fc1dde108845d0924ce6dd7/1606540773440/93910917122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fbf329e-93c3-4fd8-b756-17dbcb8dcfbc/nezaborezawaburomexizekow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c3d140f1034a5caf136a/t/5fc3eb1e18e72e5fdb50d54d/1606675231279/16962446466.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/46694518900.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc132d08787e879896ded78/t/5fc7ff6af66d453b754fd657/1606942574519/sugajekegudeboso.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_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 5504 bytes
SHA-256: c7a7b75208689cd764f0093afb82d771fb11c34145dc831062719432307c1fa1
font_01_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 11576 bytes
SHA-256: 69be8199ab6b0abe3b357a063256da9310317c24db49895d60eee6d4f53acac0