Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fa8359f25b0b3c…

MALICIOUS

PDF

72.8 KB Created: 2021-03-16 19:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b9d7d71c3e6565a7d5c8013390519cf3 SHA-1: e2fd475ef530113dc5f8b4bc743404f9a7a177a6 SHA-256: f2fa8359f25b0b3c5ed8763f20dc01a05a4504f80e5f6fa58e8bd0c473b8db6f
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 pointing to disposable domains, suggesting a link farm designed to distribute further malicious content. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://druttle.ru/award?keyword=pdf+to+word+converter+free+download+windows+7 PDF link annotation
    • http://50offshop.pro/vibomufilapztje.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/fegiw.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/tableau_activation_key.pdfIn PDF document text
    • http://naturebiolog.space/31362055824yqnbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_60438a3f5e1a6.pdfIn PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/d97e917c9.pdfIn PDF document text
    • http://netlysy.online/65471437466h0gmi.pdfIn PDF document text
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/e9099079103.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/9d6af3704de04.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/8280113.pdfIn PDF document text
    • https://sererepe.weebly.com/uploads/1/3/3/9/133999843/5160f3b22170266.pdfIn PDF document text
    • https://xavuzilutose.weebly.com/uploads/1/3/1/0/131070872/e7ec23d3bc42d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fc9336899326.pdfIn PDF document text
    • https://lalibirubifo.weebly.com/uploads/1/3/0/8/130873838/12784b943a5b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_5fde5717d4e61.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/aesthetic_bodybuilding_routine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pawepeg.atwebpages.com/auditing_and_assurance_services_16th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2ef8d4-c253-433c-9661-8bb2881b6f97/31707662552.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/how_to_mix_paint_4-1-1.pdfIn PDF document text
    • http://vobikeretuwof.atwebpages.com/amc_10_b_2020_cut_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fa99d6-e538-4537-af42-9ea0cffa4bc2/how_much_does_it_cost_for_someone_to_make_a_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f70a155-6a19-45ed-acb2-a9adc8d6a7e5/bissell_proheat_2x_advanced_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666df316-7538-4754-ac08-a4ceed572bf1/18256805466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ffb674-60d0-4e2b-a372-f61284fbe7e2/18383284283.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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 5248 bytes
SHA-256: 4269d96747a6a0c13d31f418aee6ecf79bf086ca2490202801320fe9576fba37
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 10624 bytes
SHA-256: c04d50275ba30ceaba4aeb1c2d9daf0deb14698e4865099fb40b23d9c579a87e

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