Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbf85aa21d3f746…

MALICIOUS

PDF

83.4 KB Created: 2021-01-30 00:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2885c6f31b2c63d4d1738345c181c227 SHA-1: 53bd5516b6ad4d10253c2a2f057f32d5bc4e49fb SHA-256: 0cbf85aa21d3f746ec149d4307b3e6dea45ea6d7d1b1e162bd4c0751d8ed883f
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/wb?keyword=wheel%20size%20bike%20700c In PDF document text
    • http://wegisinebirixe.iblogger.org/8578793642.pdfIn PDF document text
    • http://niverokime.iblogger.org/2nd_interview_thank_you_email_template.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/wirufete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5fd80b3e34b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5fd8846a13db6.pdfIn PDF document text
    • https://cdn.sqhk.co/xakutofi/hsUMkid/35226230703.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/1175994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383300/normal_5fcd40d3ab8d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_5fe77a56059f8.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/bhfgdii/road_turn_crossword_clue.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/vodezefo_bojodug.pdfIn PDF document text
    • http://kuzojud.66ghz.com/audio_bible_free_firefighters.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/jc8Tigc/rutepeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5fe647dd462f4.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/purejanuresosafu.pdfIn PDF document text
    • http://sijazoge.iblogger.org/gabipezuj.pdfIn PDF document text
    • https://gavanigo.weebly.com/uploads/1/3/1/3/131380609/15d4c31f90.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/da2791d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 5068 bytes
SHA-256: 94c4d90f330d107f7bb48f7dfcca1f0649734f3ed5ea329e305beb26e50f1c34
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 10664 bytes
SHA-256: 8a80f7302dc661a575748085e4b7a14c943241fbaa173da0e91d9c428247d578

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