Malicious PDF — malware analysis report

Static analysis result for SHA-256 905212bdec3ebba5…

MALICIOUS

PDF

71.6 KB Created: 2021-04-07 18:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b54f5ed5b4cce987bd1821c838b98b4b SHA-1: d5c8ea9b98c1abf110785b883e4534d627f60e28 SHA-256: 905212bdec3ebba5cf20919ba468c82de1aa989646ad4aa632c32e785af2d1bf
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL `https://soxebez.ru/strik?utm_term=arm%2527s+reach+co-sleeper+cleaning+instructions` is a primary indicator of malicious intent, likely leading to a phishing or malware download site. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=arm%2527s+reach+co-sleeper+cleaning+instructions
    • http://sakaxek.mygamesonline.org/83105627688.pdf
    • http://pugisapi.mypressonline.com/barnett_jackal_crossbow_hard_case.pdf
    • https://cdn.sqhk.co/torazanopuni/ffjejhP/ctet_paper_answer_key_2016.pdf
    • http://pokinusuvato.getenjoyment.net/dijavigevodewafup.pdf
    • https://cdn.sqhk.co/lazemowul/hjNhbfu/rigugufawofefoxowexa.pdf
    • https://cdn.sqhk.co/bejomewuv/Qhagjgc/whispering_woods_resort_minocqua_wi.pdf
    • http://vitofemegawe.getenjoyment.net/6080223072.pdf
    • https://cdn.sqhk.co/mitejapeki/njhhijm/genesis_7580g_datasheet.pdf
    • http://bipowilago.mywebcommunity.org/aprender_falar_espanhol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_41e3b05a2f174244bfdfa327681f1f99.pdf?index=true
    • https://uploads.strikinglycdn.com/files/664be034-7b13-44b0-9ea7-5fc57afb87eb/mf_124_baler_knotter_parts.pdf
    • https://uploads.strikinglycdn.com/files/5163e71a-b2ff-4491-a3a3-d8852e2bcac0/international_journal_of_molecular_and_cellular_medicine_impact_factor.pdf
    • http://biwosagamivi.myartsonline.com/how_to_install_first_alert_smoke__carbon_monoxide_alarm.pdf
    • http://liwetagosozel.onlinewebshop.net/tolutibuxat.pdf
    • http://pufovipejofag.epizy.com/pimizewurepugevezo.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_dc68e2d8a7824d7bb3caa8183b340f80.pdf?index=true
    • http://pegesij.rf.gd/nixoba.pdf
    • https://uploads.strikinglycdn.com/files/7727acc4-aeba-40dd-95f0-a0235f7c96c8/american_born_chinese_jin_quotes.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_7dfbe3a4d4f24b07a1550ac8cc91dc7e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da44.bin
77d0a8608732a8f45b4362c3857e1bf036a224d90e78e4158317c4b3ec6bb519		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 5400 bytes
font_01_sfnt_off0000ec85.bin
d8ac1ba3fd0bbc01b3a326f3dfa0ae76801d8301d60a2453ffd9fc4efa780ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 10852 bytes

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