Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb544815c4dbc9b…

MALICIOUS

PDF

69.4 KB Created: 2021-01-17 23:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0d4da56441dc6c3c44b5bd553ef0116e SHA-1: aef00e163cc64a20ec12bb907fb3e270438f6d99 SHA-256: 0fb544815c4dbc9b1335b0879e5c4d255b9c2ede4c5e104724e8c4f64fe92fd0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to its generation by wkhtmltopdf, and the presence of external URIs points towards an attempt to redirect the user to malicious 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
  • 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://trafftec.ru/123?utm_term=sissy+feminization+guide PDF link annotation
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/4333548.pdfIn PDF document text
    • https://site-1168290.mozfiles.com/files/1168290/mapumumutum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_6003b0941ce9a.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/e9398e.pdfIn PDF document text
    • https://site-1175602.mozfiles.com/files/1175602/femigawogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_5fa057de44def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5fc2de874cc91.pdfIn PDF document text
    • https://cdn.sqhk.co/wemupaxuziv/NieKShi/cut_the_rope_2_gold.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/java_1__8__0_202.pdfIn PDF document text
    • https://pamuvomamutafa.weebly.com/uploads/1/3/4/3/134305197/rinafafukajixaxixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5ff298d0ae338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecf2784aba.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/mijedusovineti/mabupafofabovegajidibeg.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/44254302595.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/conditional_sentences_worksheets_for_grade_7.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_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 5356 bytes
SHA-256: 6877f24cc7d56af52f922ccc17d4868486d492cba903536ba0b47c581450c316
font_01_sfnt_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 11408 bytes
SHA-256: 5bf1fe226161aefa3349a18166ab953176008e4a3ba9ef688a6034ee8310ae87

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