Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71cc9b37bd783de…

MALICIOUS

PDF

72.9 KB Created: 2021-02-17 07:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 944abdf3652c9cf59a98c86ce37ae54e SHA-1: bf1e998e1f25dde6e95628504c8749f723401ffb SHA-256: c71cc9b37bd783de97a78db553c23bcd45e6ad688613e69f35a6e39f1d24fde1
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 0.9989

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://jottigo.ru/123?utm_term=trigonometry+formula+triangles PDF link annotation
    • http://sendgrid-de.com/bowanivetoranenet8h7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480745/normal_5ffff65d1e288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_6004073e4a253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_6017c3a2056d0.pdfIn PDF document text
    • http://zebisipojadowe.iblogger.org/81797112163.pdfIn PDF document text
    • http://gisonanezoboru.iblogger.org/access_control_system_interview_questions_and_answers.pdfIn PDF document text
    • http://neuroncraft.online/fizeginoxxvd6.pdfIn PDF document text
    • http://magic-spring.com/nadiwalupadaruzogowizew47pvb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_5ff20faa81d96.pdfIn PDF document text
    • http://copyright-central-media.com/broadsheet_brisbane_cbdiquyn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414176/normal_5ff87cfab2d23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5ffac3e66573d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_60278af2e1cd5.pdfIn PDF document text
    • http://kengoru.space/sport_event_promo_after_effects_template_frees1zsu.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
    • http://nekedejiwaki.epizy.com/ramanemoxazuwuvovoje.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/67044639778.pdfIn PDF document text
    • http://gugawojakopa.rf.gd/movenoz.pdfIn PDF document text
    • http://joxumokuri.epizy.com/zusula.pdfIn PDF document text
    • http://tepaduvofevog.rf.gd/16195923236.pdfIn PDF document text
    • http://rokusagotigenov.rf.gd/computer_institute_admission_form_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/wordscapes_answers_daily_puzzle_october_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/android_tv_box_mxq_4k_ebay.pdfIn PDF document text
    • http://xovimed.rf.gd/bilujazazir.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/xefuzaresibi.pdfIn PDF document text
    • http://damusoborubumo.epizy.com/pets_at_home_crested_gecko_care_sheet.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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 5020 bytes
SHA-256: 40ee4c3a665f64cbd57d81bb0275af8a25379d38fb611db5d3e9056d16532dbd
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 10556 bytes
SHA-256: fb6d5502efc038431bb135ecc6e2d01e9b5c41ccbbed3fba34b24755d5b2ed61
font_02_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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