Malicious PDF — malware analysis report

Static analysis result for SHA-256 937b1b6225e3a875…

MALICIOUS

PDF

71.0 KB Created: 2020-12-23 17:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2761936a862b7732d315adf8f229f992 SHA-1: c89dd852893c388c332840a134840eaf4742c8af SHA-256: 937b1b6225e3a875a8e0aef6dbbea54aa8962f00ca996e5f661fb0402a99ba4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'traffnew.ru' which is suspicious and likely part of a phishing or scam campaign. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to drive traffic to various sites. ClamAV also detected this as a phishing-related trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=apple+music+free+premium+apk
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/120f083d45.pdf
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fd343df4f41a.pdf
    • https://cdn-cms.f-static.net/uploads/4413978/normal_5fa831373c6f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/laradusa/autosketch_software_free.pdf
    • https://uploads.strikinglycdn.com/files/8a98907b-4fbb-4de5-a89c-3c2f023fb8d2/bidogaliwojased.pdf
    • https://uploads.strikinglycdn.com/files/5649913c-fb98-48c9-a2c2-76349189940f/98510800793.pdf
    • https://uploads.strikinglycdn.com/files/5180d451-35dd-4036-95e5-f06a926e26f7/82946344946.pdf
    • https://s3.amazonaws.com/bugutaj/23119816303.pdf
    • https://s3.amazonaws.com/fosalizuzu/english_vocabulary_in_use_audio.pdf
    • https://s3.amazonaws.com/lokijuronig/nawagorodif.pdf
    • https://s3.amazonaws.com/xurixado/tamil_action_movies_in_tamilrockers.pdf
    • https://uploads.strikinglycdn.com/files/660a4003-bd60-43e0-bd55-c90999aaae7c/gagodaxobiribe.pdf
    • https://s3.amazonaws.com/piwanisaj/characteristics_of_mammals.pdf
    • https://s3.amazonaws.com/mexijegedakol/metojapamutowabavinojinoj.pdf
    • https://s3.amazonaws.com/fifomi/clearblue_digital_ovulation_test_read_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d858.bin
b9457e835c44335f0f7efca2a60d7196e22532961c6668f4aa74637ea01879ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 5212 bytes
font_01_sfnt_off0000ea06.bin
34a886bbe3bf4dd88ae5ebc65a5d76ef59a78863c2551edd53bf5ddf8214b8f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 10920 bytes