Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb0fd77a5caac8a…

MALICIOUS

PDF

84.7 KB Created: 2021-01-04 19:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b03fb68b7a7a05191a227578400f2ee0 SHA-1: 257d8f97a4872822b6d1c66e12ebbc86b4451754 SHA-256: 3cb0fd77a5caac8a21dc42db19f40a83271b263adcbb94850b5a3174cffe2577
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=cereals+and+grains+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fb418fd97693.pdfIn PDF document text
    • https://wivujawa.weebly.com/uploads/1/3/4/5/134582083/jomavosune_bexelenumaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcf297f3206f.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/0f010289267.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/dulefipalep_jobowajoxugo_wiribulelom_nuzigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_5fe6fbefe97e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5f93bf6054c4b.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/7225792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_5f9ef304d044e.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/naduropizabi_gomun_dikip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb4d4d9-9c78-4869-b44b-dd62b2b6662f/besifepotabujemid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fa0f96-ce07-4cba-b493-54af4c31a70e/vopabawogijurijexomiwiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0605e1-b7e4-459b-a666-b690f06e59db/86752047457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be54301b-1d1f-4630-859e-fc6bcdd73ca3/nook_glowlight_plus_online_user_manual.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_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 5112 bytes
SHA-256: 2bee0e418dca4df02a8655e37bfa0137f07637a90496891e8267eb9df45fd851
font_01_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 11260 bytes
SHA-256: b27a74d21aa888699294343c94ebb297708c018d2470b1d2b4467842329d60a5

Open this report in the interactive analyzer, or submit your own file for analysis.