Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4ac669c0f7cca1…

MALICIOUS

PDF

102.5 KB Created: 2021-03-14 01:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 69719fda716a20563b8634cc8a194651 SHA-1: 857e0aedbba2c8dd3637b557bc58811aa2ea5cf1 SHA-256: 5b4ac669c0f7cca14c59b2117fadaba86a3fd518c54c5700961fdd2614346478
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear instructions or lures are discernible from the readable text. The primary attack vector appears to be directing users to malicious external sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://vilenefex.ru/award?keyword=bukhari+shareef+pdf+arabic PDF link annotation
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/konunugu.pdfIn PDF document text
    • https://munivimisidifi.weebly.com/uploads/1/3/4/7/134772296/609850.pdfIn PDF document text
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/9e5496.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/6729430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403128/normal_5fec5c776b751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fffea6ef1d4d.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/kakow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_5fc70fedb6d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_6033e8acad253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5ffd1a6487ae6.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/disege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5fdf8fcba3df5.pdfIn PDF document text
    • https://wafilanukeg.weebly.com/uploads/1/3/5/3/135309269/2125273.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/77750bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_6021d19ad1439.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/leributafa/1503288103.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_14e14b2fab1f4e8fb16a50999677456f.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_2a4f97e9bd554ecb92553b157bcb25c5.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_5915396baa544005b39dc93fe988a84b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/smeg_induction_cooktop_guide.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_c0cf29e05af6468da1d1fb1bfc28b449.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 5464 bytes
SHA-256: 96dc9fe7180b7c0e876216b910e8ea681bdb0e9578bc24f95c1180333f5507e7
font_01_sfnt_off00013b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 14848 bytes
SHA-256: 0c37c27356fac15f97b359fb57d0cb7a4e5b6c763ce0cce30fd61b9d01c885dc
font_02_sfnt_off00016809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16809 21584 bytes
SHA-256: 347c4cdd790103e284fc67b0fdd2870d2c579b3022e1b375f76fe293179cc632