Malicious PDF — malware analysis report

Static analysis result for SHA-256 685b974ff8d41ec6…

MALICIOUS

PDF

82.2 KB Created: 2021-04-09 05:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 91ab206d6b7682813b1037b2e7e61eaa SHA-1: 1040267ba82c20b952aff0f5f53cc860ada37901 SHA-256: 685b974ff8d41ec6419c72d6827d9cd63b838854b2fcdf1b3db2f549db4c671e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://xezojetit.ru/strik?utm_term=human+trafficking+newspaper+articles+australia PDF link annotation
    • http://tertov.xyz/s_b_deorah_college_uniformf9nn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_606ea93f0418b.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/huduma_application_form.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/13361475210lxxpg.pdfIn PDF document text
    • http://shoop-fm.ru/23573436709zk8y.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/3991369.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • http://hallop.xyz/bimufuvevut7plq4.pdfIn PDF document text
    • http://businesshelpservice.com/walden_thoreau_castellanooqlam.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/49602152008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_601066bd6df92.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/83466979881.pdfIn PDF document text
    • http://ita-bio.space/atlas_lsat_logic_gamesnlbbb.pdfIn PDF document text
    • http://momentikshop.space/msrm_repeater_instructionskqj59.pdfIn PDF document text
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/bisunezor.pdfIn PDF document text
    • https://nafizanoride.weebly.com/uploads/1/3/4/5/134596231/7507184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_600a1fd232931.pdfIn PDF document text
    • http://relodifalixogo.scienceontheweb.net/candida_albicans_bucal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/data_structure_algorithms_tutorial_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/evernote_templates_for_teachers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 5224 bytes
SHA-256: b4ebb657ed3b713c4d16fedf822b5ee2ab2b9830922d2beac50b82990b82c32d
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 11484 bytes
SHA-256: 4120c2ae7514ed1ebb5602b47bcc6ee5ecc79a200d481001d52200597efebb51
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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