Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5ec63cb91931db…

MALICIOUS

PDF

85.1 KB Created: 2021-03-23 00:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5645adb3f708e680a0167af628c3e766 SHA-1: b921d6346b99db8df73796edf4cd6530d5eda26c SHA-256: 2c5ec63cb91931db2bb0fc004b4e86a6fce337ecded51a95fdbd4c39efd02a37
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://midufefew.ru/123?utm_term=embedded+interview+questions+and+answers+for+freshers PDF link annotation
    • http://fasad-dom.site/samsung_dishwasher_dw80j3020us_user_manualyfghp.pdfIn PDF document text
    • http://useraisins.pro/vuxujidubiximowezatefilob7xovc.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/NmJidhE/golazo_football_penalty_shootout_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jggevrx/40126300795.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/felhjBB/tibisaxutegepusot.pdfIn PDF document text
    • http://autobuff.xyz/sofetoteveradafuiedy6.pdfIn PDF document text
    • http://24goodstore.site/highwayman_poem_definition9qq8n.pdfIn PDF document text
    • https://nikoxekuw.weebly.com/uploads/1/3/5/3/135345322/926cde.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/fazuzuze.pdfIn PDF document text
    • https://jimiporumina.weebly.com/uploads/1/3/6/0/136088268/topufosonajoso_gulumazabamudir_goxed_kozakajonupunis.pdfIn PDF document text
    • http://olipaka.xyz/nemotagewomufexazh3e22.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/igejfif/the_weather_channel_cast_members_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/fb1toib/83359706930.pdfIn PDF document text
    • https://kenofina.weebly.com/uploads/1/3/5/2/135295682/8092863.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/fofumini_sevizatirutuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/8096469004.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/28991913468.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/92400040798.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/74434220479.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/why_is_my_lg_dryer_not_drying.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/bawisevanenobav.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/azbox_bravissimo_plus_transformado_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/19348601816.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_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 5488 bytes
SHA-256: 011bc121d2355e15c62d609ddba5f4423c554d94ff0cd9a03378e13b38a6cdec
font_01_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 10924 bytes
SHA-256: 5230c81fca3410276d9338d1e034d6b47b7d6e8cb6a0f199ae656593233d6fe5

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