Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b84f87e5f5d82a3…

MALICIOUS

PDF

68.8 KB Created: 2020-12-31 21:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1fb3a04a0c0e74de6efab5a48007c7ad SHA-1: e904473632f1eb67c61d5fe06380fa4f8e524221 SHA-256: 0b84f87e5f5d82a3f6a5e84bc6d7870fc30209b539e6bc0195b2ce3bbb06efa7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=sweet+potato+a+vegetable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fd3be03ad752.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/vurobis-xirevanukabibuk-mewimazeso-lemixerovij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386335/normal_5fc396c9e6b1d.pdfIn PDF document text
    • https://xusudunegowubub.weebly.com/uploads/1/3/0/7/130739081/7303d362bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f8c1c90e4d78.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/030d9c1d999c2.pdfIn PDF document text
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/1ea17a5d1c4cf9b.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/3626776.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/aieXjhp/zurebagexoje.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/6304031.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/4972e1e7-ed20-4f6b-997b-eb877f9a7e85/82973026859.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/thiwanka_dilshan_mathaka_amathaka_ilu_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/84370558723.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_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 5108 bytes
SHA-256: d3c49dec1bce50ee595da3fd05b135380203afe7b68fa82588d9368c4db7ec11
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 10624 bytes
SHA-256: 584aa9cec1b62a13ec45f3b9972ddd4400d64be8a6e11ba98f56ba86942e7e63

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