Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c35012ef2e9cf2b…

MALICIOUS

PDF

81.9 KB Created: 2021-04-27 12:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c5f616c8c1bfa32b1373f5a374d59202 SHA-1: 09e3e776f659b350897d415e4ae98330a3df7f20 SHA-256: 7c35012ef2e9cf2b155f500b4a3e0ffbe7fa4f6ad95200cbac915e7319c60153
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one URL is explicitly identified as part of a link farm designed to redirect users. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=samsung+un32eh5300+remote PDF link annotation
    • http://helplnstagramcontact6088757.com/define_narrative_poem77ktm.pdfIn PDF document text
    • http://covid-19online.site/99940907791owfjd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_6048cd6aac9dc.pdfIn PDF document text
    • http://begdas.space/76717675231pyuwr.pdfIn PDF document text
    • http://nanolenka.xyz/xobupufidukody6xmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_600d96ff259fd.pdfIn PDF document text
    • http://tumbaa.space/cerebellar_ataxia_exercises23tbj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5fde581dbf0da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_5ff0dad3820b8.pdfIn PDF document text
    • http://front-glass.website/684516518127q857.pdfIn PDF document text
    • http://getchambre.xyz/8205252912038ksb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_606e9c15c8141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rufonali/position_velocity_and_acceleration_graphs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/baaghi_1_full_movie_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/mufem.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_9beca881c3a14801ab67c0f04159653e.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_ffdae45d50914bef8ea737961f709a3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/zotux.pdfIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_d059c0c4704e441dbdc9abee8e72b869.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_8e97397284644d408b85cb0897b7f65f.pdf?index=trueIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_825ede5215a140129270edd94cd9c230.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_f5bc0101154147c582e2490b164072d1.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_f805a1bcd13c4c0a9b7bbe638ccb079e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/2680951315.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 5568 bytes
SHA-256: 115d517a397f6328f04702953ff0a42dbda6b39dfefe90fc998e2b4f7216435e
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 11472 bytes
SHA-256: 44c0f6f2214f548f34cfc69de32d1381afcaa183b7c09f7a8b5d28939c7f1dd5
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c