Malicious PDF — malware analysis report

Static analysis result for SHA-256 f386a8de937b2f27…

MALICIOUS

PDF

67.7 KB Created: 2020-12-07 18:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b32c6b8eab66b85b01f9e94590438f05 SHA-1: bee10cdd55af7efd707f253af55638fe50ff4c3c SHA-256: f386a8de937b2f27b0f29e48896e2e239c647bbe1101716187e5e55461df51c8
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, and a PDF_URI pointing to a suspicious URL. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URL and the nature of the link farm suggest an attempt to redirect users to malicious or unwanted content, possibly for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=marvel+future+fight+mod+offline+apk+userscloud+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470981/normal_5fa58a52af473.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/xuwevitogu-puloka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fb8861ca2f4f.pdfIn PDF document text
    • https://wirufaxiferid.weebly.com/uploads/1/3/4/5/134599318/24e26bb58.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/leguvefu/burekeb.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/kizagopowa.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/87593208556.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/7710469082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0e411d-8cba-4e5e-a263-5e656077e4a6/pikuvifelalobiga.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/40129984357.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/fexopojafom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a4062e-462a-4fd2-aafc-58d640943cc0/maggianos_heating_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/28815690618.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/eagleview_health_and_rehabilitation.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/allcast_premium_apk_reddit.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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 5792 bytes
SHA-256: 79dc889582af4b036fc8f68d1a9bb02bb4d27dc2bf19e97215ecbfecd95a549f
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 10592 bytes
SHA-256: b7ba0ac935351823160a58fb3e79be2d8c39e658427191e19a6525c1bd1896ea

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