Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfa77768c860f4a…

MALICIOUS

PDF

74.8 KB Created: 2021-05-30 17:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cf4568a175ba20803226827689cd22ce SHA-1: b7052f3c2e2913be2cc42f174c6f48baff4ad333 SHA-256: fcfa77768c860f4ac827ea858cdc8d3f1fa71c4762cc3f1f018f7d48a2034778
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 a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a 'weather report'. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://dugedepap.ru/123?utm_term=dillsboro+weather+report PDF link annotation
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/gipox.pdfIn PDF document text
    • https://foxidaxoluw.weebly.com/uploads/1/3/4/0/134016742/7511173.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/fewuwi.pdfIn PDF document text
    • https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/7e7eecd7.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/bexakirox.pdfIn PDF document text
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/6432674.pdfIn PDF document text
    • https://defifipak.weebly.com/uploads/1/3/4/4/134442047/xadezifopipu-josupagikajesu-zoriribunega-mital.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_601b88d9106bd.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/4031512.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/3489356.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/furetisonufux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424672/normal_5fef9aada1254.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/5a8e7a02-946b-4666-9342-cb16fcbd9f36/raziziregimotekematukifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ccbc5c1-d718-4b47-a551-93382f08998b/the_boy_in_the_striped_pyjamas_full_movie_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d2d15f-b939-48ea-85e4-8adcabb8598d/marvel_films_in_order_of_release_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d44d5ce-53a0-485f-a446-609f76ffcf9a/tarot_cards_online_shopping_in_india.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_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 5140 bytes
SHA-256: d494e0c192e2d29d71fe3530a4c023106e71b07c0a53ffd18cbd7e25a4f5c64b
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 11080 bytes
SHA-256: 17c619c98b49d12a277a013ab54d331947cd27acf02120d6825a63dae103b651

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