Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bb8c00b3c31b7e…

MALICIOUS

PDF

72.5 KB Created: 2020-12-26 01:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c203d6a088bcc39875f78bbb55810178 SHA-1: 1cdbbdb8304b75cb397f24044ea687986ef77151 SHA-256: b5bb8c00b3c31b7ed91d97a77b67d707859ff00d4ee0c98326ca906431b173e0
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a prominent one pointing to 'trafffi.ru', suggesting a phishing or malicious redirection attempt. Heuristics indicate a link farm and a redirector, reinforcing the malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/aws?utm_term=fire+alarm+maintenance+certificate+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f88416ea230e.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/6656448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_5fb536628b94a.pdfIn PDF document text
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/losiduf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5fa63a15a573f.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/lalajubejadu.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/vedafuxuxamegor_narivajusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fdb2c877eef4.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/05cb2af5-af39-46ab-82ec-9e6e3823133d/treasure_hunt_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/actuators_and_sensors.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/11520715347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffd1273-4fd8-499d-ba16-febb4e6cc629/affidavit_of_heirship_texas_dmv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef442b4c-d63b-4b47-892f-116e2fc4afe5/58033921298.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/cpt_2020_guidelines.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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 4936 bytes
SHA-256: 5e1aac6707ea25716b4766201a8c6e0355dd8d7ec05f264d19293d6f4fb6d169
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 10428 bytes
SHA-256: 2cc52be8d4dc6f33e55c05622d6318a532d38efa12f789b73c22a9334453ae22