Malicious PDF — malware analysis report

Static analysis result for SHA-256 5613a01d68a4e96f…

MALICIOUS

PDF

72.1 KB Created: 2021-01-15 02:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0e5543b62342e21d8fb618af5d54551c SHA-1: 8d5d806c9a5607c573f415682883892e2b65ea83 SHA-256: 5613a01d68a4e96faf7e2d56dc951a58362e91499c31717e2ef3abcc66172c50
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit user interaction to navigate to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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://traffnew.ru/123?utm_term=circe+pdf+free+download PDF link annotation
    • https://wukonoru.weebly.com/uploads/1/3/4/4/134441013/32e456058a70a77.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/lurudar.pdfIn PDF document text
    • https://site-1172263.mozfiles.com/files/1172263/my_favorite_movies_list_imdb.pdfIn PDF document text
    • https://site-1166044.mozfiles.com/files/1166044/how_to_report_charitable_gift_from_ira.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/if5XUsO/cosmopolitan_hotel_las_vegas_buffet_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_5fd7b2bb5da80.pdfIn PDF document text
    • https://site-1168179.mozfiles.com/files/1168179/stunt_car_challenge_1_mod_apk.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/mutamupidunale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fdfba12718f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 4968 bytes
SHA-256: dfb66383b0130223efe0a14a8cb903bd732e28fa90cb758ac22cc90ba9a9b0a4
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 10512 bytes
SHA-256: 94775913a93cfbaba17f1b275618a0832f37de8e3e7331577e30b6672ece51d1

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