Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f37b3c0472d9a2…

MALICIOUS

PDF

71.1 KB Created: 2021-01-02 01:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b77ce859b47d59c069c520346a9538f0 SHA-1: 7a42f43bb97286cb5cfcb331399fe07374830c2c SHA-256: 77f37b3c0472d9a2e9ef42eb21da0457eed813dd39dfeb0775cf0b044f388cd8
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to malicious content, likely disguised as a cracked application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gettraff.ru/123?utm_term=filmic+pro+apk+cracked In PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/3963638.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/AFMBCjg/same_day_cash_loans_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366637/normal_5fed966ddddf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5fe92f55cb611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5fdeac0db5bdf.pdfIn PDF document text
    • https://cdn.sqhk.co/zifakepavax/FjfL5wk/tovuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8f16129b9f2.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/tazibabebamep/23824815767.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/77557946675.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/milowubet.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/lagu_black_brothers.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/39891459296.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_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 5060 bytes
SHA-256: 7968f02e54713c83746b7a5e3170c6b14267b47a5bd7b6d6cd2e33093b5e6584
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 11036 bytes
SHA-256: a9e3c161a18ae50aff5d4b9d4954597be1b073d528a87d507d97efb58f2502af

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