Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1e9569dce56b67…

MALICIOUS

PDF

63.0 KB Created: 2021-01-11 14:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 650c69d58524134e0ef8cd897d629cff SHA-1: 9bfefe796c4e344faddb2b670c9028429f53e5d6 SHA-256: 1e1e9569dce56b67661ec000da8f670ec25d986316ce7ceaa7e9cc0a6a897f90
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user interactions, likely leading to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=bhubaneswar+weather+report+today PDF link annotation
    • https://site-1166618.mozfiles.com/files/1166618/whatsapp_apk_pure_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_5fbe55572a09e.pdfIn PDF document text
    • https://site-1177540.mozfiles.com/files/1177540/t_mobile_prepaid_recharge_usa.pdfIn PDF document text
    • https://site-1167925.mozfiles.com/files/1167925/notes_in_sheet_music_piano.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/2b87362bf.pdfIn PDF document text
    • https://kunobozawi.weebly.com/uploads/1/3/1/4/131453145/dilevoturiw_pakomonoj_dijuzi.pdfIn PDF document text
    • https://mopirolelawa.weebly.com/uploads/1/3/4/0/134012876/baxozesodeduf-mipamevivumu-rifesemix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5f9de2cf4866e.pdfIn PDF document text
    • https://site-1176587.mozfiles.com/files/1176587/ikea_dressers_for_sale.pdfIn PDF document text
    • https://sexiguviwuzokal.weebly.com/uploads/1/3/4/6/134687255/ecd708e065b.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.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/midipes/gopro_hero_4_update_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/42872705743.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_off0000b8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AE 5396 bytes
SHA-256: 1b07352cdd1049f91dee6173530a5b2a356968654e7f7d0a65af97cac5d33f8d
font_01_sfnt_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 10088 bytes
SHA-256: 388ee8b9c3198c4e1a087f9043ece5a33ade12b4731edde47d969bb2cadff61b

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