Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb642e2f5c63bd5…

MALICIOUS

PDF

80.2 KB Created: 2021-03-07 09:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8cf6d9864780bfdbc95888c27513895 SHA-1: 8a78e9b76e47911eaa8dc5b8b362c819b3185024 SHA-256: 5cb642e2f5c63bd5d67f8cc923f61dfa6d97637a22affcd207f7b77f03aecc36
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://zajinet.ru/award?keyword=where+can+i+get+a+free+pair+of+glasses' and the heuristic 'PDF_SEO_LINK_FARM' indicate a strong likelihood of directing users to malicious or scam-related content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=where+can+i+get+a+free+pair+of+glasses PDF link annotation
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/fekas.pdfIn PDF document text
    • https://kuxoredekudo.weebly.com/uploads/1/3/4/3/134368385/1cb7e680.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/xunolupere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5fcdf3038ddf8.pdfIn PDF document text
    • http://interbankdigital.com/soruwenofalowun3nbsu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5ffc0be848779.pdfIn PDF document text
    • https://mexekujiwununiv.weebly.com/uploads/1/3/1/4/131407761/2298208.pdfIn PDF document text
    • http://idealica-italiauficiale.website/babylon_bee_headlinesop2dx.pdfIn PDF document text
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/dofagilakamow_povalikuf.pdfIn PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/xoneve.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/wubuwasirare-dotade-nafuxepe-jonajorumawusoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_6019594550f16.pdfIn PDF document text
    • http://gratoram.site/463092234142etnz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_6026228823633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_601392b586ea7.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/konatojigawutume.pdfIn PDF document text
    • http://mgacessoria.online/85858291881b1uke.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/ee69fd1e-aab1-47de-9674-203170892020/ps3_holding_power_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37cf8c6-b31c-4cb1-9420-3949f796fd04/78431084598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6455cfa-b625-458a-9deb-f7f386dc2d0d/21962399456.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_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 5288 bytes
SHA-256: 2cc86b8494d412f06278b80106f1705e4f976cca8bcfee578116411c71fe8ac5
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 10208 bytes
SHA-256: f9d1a3a4e66d23ed48a67098212be43b0fe375a8a2c0e2b2dd2a3552821121e9

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