Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4e061a87e87da3…

MALICIOUS

PDF

78.1 KB Created: 2021-03-27 11:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eb22efe349816089751191af2101b652 SHA-1: 566a558cbb0522cfb695c677c38f46eff42d9b28 SHA-256: 2b4e061a87e87da3bcbab7ac2c81b8bd48e414cd9755d16a4195d8e726c31087
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://baarspo.ru/123?utm_term=inventory+on+balance+sheet+or+income+statement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393901/normal_60130756a0b62.pdfIn PDF document text
    • http://deemonatrafik.xyz/65034982390mo6dv.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/datizozegediwag.pdfIn PDF document text
    • http://novonet.online/latest_call_of_duty_xbox_one_xscph0.pdfIn PDF document text
    • http://itclick.info/west_bend_microwave_not_heatinge11gp.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/meviludexut-giwaga-kadabakare-depepimatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5ffe17899cb99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_6035072b38466.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/6545039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456996/normal_604fb8c54ade9.pdfIn PDF document text
    • http://loveworld.club/fufokimaziwagosobbuauh.pdfIn PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/kivatikebuxusax.pdfIn PDF document text
    • http://merishwheelrecords.com/zofubasuw5jvi.pdfIn PDF document text
    • http://cleaner-inn.club/46761140116wyhe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fec2ed57032f.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/23836215233p9lm7.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/legapatatezisa/benobupajapafivivifu.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/adornos_para_sala_manualidades.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/what_does_social_researchers_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/husqvarna_435_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/killing_floor_2_demolitionist_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/how_to_program_a_one_for_all_remote_to_a_sanyo_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/punctuation_exercises_with_answers_for_grade_1.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_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 5280 bytes
SHA-256: 23fa9a15dbe8938ea21a62b996fc460250dd7a4ae4867b1f36ac8490941fd77a
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 11428 bytes
SHA-256: e1d591d85ae0ae2246a90934e431631bdc0da519b875141e219a8656dc1ec51c

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