Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd8db721203381c…

MALICIOUS

PDF

90.3 KB Created: 2020-11-25 04:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 427bde909049bf241c997cf3e8d8363d SHA-1: 3bd06e5ea2f13a35fae8ca0a7296f85363f42b40 SHA-256: dbd8db721203381c899e8795924b51ad46449e33d6c4c6da628566d96b097671
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector domains identified as malicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links designed to appear as legitimate content, likely to trick users into clicking. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as phishing or a trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=how+many+quarts+in+a+pint+uk In PDF document text
    • https://tototatinup.weebly.com/uploads/1/3/4/3/134332383/radulividubepaz.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/bewifusozureg.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/bajagejofixobegaj.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/615408565db25a6.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.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/d30cf9c4-7d5b-42d5-8f17-d630f3ac0b14/gixasaguzefiliw.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/castrol_vecton_15w40_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/admiral_general_aladeen_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea513a4-76a7-426a-a426-6d749ff04f1d/herpes_ectopic_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8377c7-ee32-4d2d-8005-4ba621158e90/nport_windows_driver_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/jafirimefenopumivo.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/amiodarona_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/vshare_free_for_ios_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac54ded-cc57-4e4a-8f70-f71c3b8a657b/chocolate_frog_cards_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/jufexevosorulevivufi.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/34393661331.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012e8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E8A 25524 bytes
SHA-256: daab7fb6b6cfbb31d773bb4dd2f346630cf245f9edb4c31a970ced0dbdd1af8c
font_00_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 5276 bytes
SHA-256: c55592877d55916f7c012404876ac747b83a7876c6c6465f373da7469a93a9e2
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 11628 bytes
SHA-256: 3f3d64f04e6537128a63492f8afc217f7ff6f2d060c2e0bf853d56b3598bae07