Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6905a3200d4f9fa…

MALICIOUS

PDF

62.1 KB Created: 2021-03-03 23:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f1d4d8673102937f0e9a884c910127c1 SHA-1: cd2eb530ae775791ff19d3ebeeefea784db5aae9 SHA-256: b6905a3200d4f9fa798e28ebdba1a1e71704cb82a1fee93dfa7560f9af078cf9
244 Risk Score

Malware Insights

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

The PDF file contains a large number of SEO-optimized links pointing to disposable domains, masquerading as a manual for a Craftsman diehard garage door opener. This indicates a link farm or phishing campaign designed to redirect users to malicious infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://yafferge.ru/wb?keyword=craftsman%20diehard%20garage%20door%20opener%20manual In PDF document text
    • http://guitar.su/sccm_report_office_365_client_versionsxa82c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_601a4985cd3ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_6031269acc659.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/6972369.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/waxatodejasep-kokulif.pdfIn PDF document text
    • http://lozaratoz.iblogger.org/beresheet_hotel_dinner.pdfIn PDF document text
    • https://rezibufebaxiban.weebly.com/uploads/1/3/2/6/132695258/sanamisiwom.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/ghgPcif/88757887562.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/jfjjogh/rigajukosidodobotaxira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_6029c8c3185b9.pdfIn PDF document text
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/jiruseri.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/jfMwUjd/hay_day_hacks_that_work.pdfIn PDF document text
    • http://ruzazeruduzelu.22web.org/zalosogulazopelo.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/bidesorejosejo-semotapojare.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/todep.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_off0000bb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB82 5360 bytes
SHA-256: 8058a067e259a00ee0b410edae8db747ef9a49b063718901a0081d2b06e96f9b
font_01_sfnt_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 8808 bytes
SHA-256: 11b5de4af61a47a5036261df99eb2ada5dac978d4c46d536829f64ddac952bec

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