Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba3b3ee4be83915…

MALICIOUS

PDF

71.3 KB Created: 2020-12-19 15:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 760005c6aba8aa497793406e31d04fcf SHA-1: 91401c5e612134b832c9a909d47c737662f03e62 SHA-256: bba3b3ee4be83915e0d15b5550653976d0f93d20529576625e39bd722af2d37c
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support this assessment. The embedded URL, https://traffset.ru/strik?utm_term=wartsila+64+project+guide, is the primary indicator of this phishing attempt.

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
  • 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://traffset.ru/strik?utm_term=wartsila+64+project+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446642/normal_5fad883b54956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f941ae61cc04.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/zagubip/using_createspace_cover_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13fbc78e-3916-4db5-a2bb-f56cd2b70a38/29420746732.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/dimomad.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/triangle_congruence_proofs_cpctc_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/e-_commerce_website_template_html.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec57bb35-d229-408a-bef4-f311af6ffb6d/21985272729.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/the_old_man_and_the_sea_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/tazidowududowifelazero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2574f2-7ee4-442c-8f26-ddb729b24917/artwork_proposal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/dermatologic_therapy_journal_author_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3958212f-346d-49c8-8abf-4068c8c9744d/98587574369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5b1aeb-6c8f-4924-abf4-0fd9e32c657c/fuwejexofogugupeg.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/tecknet_mechanical_keyboard_x705_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_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 5572 bytes
SHA-256: b8f49ad53f27c3093b8a7a3c0ca464712eb56fbb3505b242d10b7524e16fe863
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 11688 bytes
SHA-256: 2f3a6e3d3b1e3fb05670044949b4d6141e1ca824d9aa13d3a93ba19713508146