Malicious PDF — malware analysis report

Static analysis result for SHA-256 728219485a5f13d1…

MALICIOUS

PDF

88.1 KB Created: 2021-03-12 14:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6d70d28acffd77489fddb6b530a66d3d SHA-1: d2076792dfc12736bdfc9b86427825b6bd6bc53c SHA-256: 728219485a5f13d13eb1aeefad61fb524eb4a7d76aa80e879974b2ce0844de2b
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and SEO link farming. It contains numerous external links, including 'http://alcexpress3.xyz/957515670677xktj.pdf', which are likely used to direct users to malicious content or phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://ponafet.ru/award?keyword=geological+processes+pdf PDF link annotation
    • http://alcexpress3.xyz/957515670677xktj.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/8ePxhaI/mezewikise.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/TjdJUih/standoff_2_download_free_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/5hbhkhi/volutopijaduzekajifomexu.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/gonAThb/ludul.pdfIn PDF document text
    • https://cdn.sqhk.co/daluzowinasu/Q75WRig/view_chargesheet_online_tamilnadu.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/KTvjgck/summer_vacation_hidden_object_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jamosolil/hiTVjjd/vijibujojotalutu.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/gFkhagh/xesetekibi.pdfIn PDF document text
    • http://bred-enligne.com/11044203674pap9r.pdfIn PDF document text
    • http://afracheat5.xyz/who_owns_maytag_air_conditioningo7p1p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_9aaa3ed0c4f24309b376d3103b3ddda2.pdf?index=trueIn PDF document text
    • http://kesinusaxaduveg.epizy.com/happy_birthday_punjabi_song_with_name.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/word_ladder_printable_worksheets.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_a4c8143e418e4b8393a28fbe1a27c25c.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_06c4df49b1b24f97a22d56250cf9c8f0.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_a35d2f070c1846178161d9aa777d808c.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_4e423bfa95ab4835855f6a6bc1b59001.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_5e7c2d16db0140d1a0ece39b5200d801.pdf?index=trueIn PDF document text
    • http://varoniwarovez.rf.gd/guided_reading_activity_13-_2_answers.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_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 5352 bytes
SHA-256: ee1945c087fa4a7e43bca54e2f1d7cc63929776833d36aba55d17d930a6cefe3
font_01_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 10376 bytes
SHA-256: 3345ce111c25fcf6ab2a73077b6c514f34e46b2850ee34aac746a632a1a3ba1a

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