Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a2044c39b34cee…

MALICIOUS

PDF

60.9 KB Created: 2021-01-06 07:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d805027f392286b7c8d188256a1b0fef SHA-1: e793b8d234559b11a1eb3ae309f9f362039753d2 SHA-256: 10a2044c39b34ceeecd82c4061474306f83848fcbd1b64e47d9a0ca382fafe81
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains, including weebly.com and trafffe.ru. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The embedded links likely serve to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/aws?utm_term=song+atmosphere+of+faith PDF link annotation
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/e79b24546.pdfIn PDF document text
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/wipoxiwadu-kapitogis-vunen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe6deaf539d9.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/jerafojolagenipag.pdfIn PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/316078.pdfIn PDF document text
    • https://nurirekesuvakip.weebly.com/uploads/1/3/4/4/134404885/dezonexuxu_bisowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413969/normal_5fe35c0a01ba8.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/726f08fe-4aa3-4ddd-a78e-7020248c43f3/gafazajog.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/40968716488.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/employee_absenteeism_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11788e50-df26-4de3-a92c-a031275e510c/mupovupewozebowusivaniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cdcb6d-c8e0-4d69-a87c-fbf1bfe4be69/natuxapeterewos.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/14752115203.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/56516622039.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/wisulatikuxat.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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 5388 bytes
SHA-256: d37a51446115b0344a7b70dc298fc48096663159012c411dbf49d9543a9d9893
font_01_sfnt_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 9908 bytes
SHA-256: 94456bc51eb8331df8ae7a451447b1a9be54b11fa79bcc0f780e203341de7ef8

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