Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b521c9c46a2a37c…

MALICIOUS

PDF

84.0 KB Created: 2021-04-17 07:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f77dcb02ffecf73786b195a14c49f6ab SHA-1: 55887455c8a5d9de9aa005be9479a69f3c7d1af2 SHA-256: 2b521c9c46a2a37c6f5fb509e95d61847ca14b49e5dabecff21ded3627e8f5b0
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 0.9998

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://seumenha.ru/strik?utm_term=mitsubishi+mr+slim+not+responding+to+remote PDF link annotation
    • https://sokudepan.weebly.com/uploads/1/3/1/8/131871622/8295453.pdfIn PDF document text
    • https://zovoxokovu.weebly.com/uploads/1/3/5/9/135957880/d5117ad93627.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/lixizaxiba-kokisokizede.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/zulezov/6056585724.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/gekidazusado.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/charter_spectrum_android_email_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/arial_mt_truetype_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/19163639192.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/kifofarixigowor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1396adf3-1319-42f2-8f5e-6ffeea0d8905/cost_of_thermo_king_apu.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/how_to_check_the_transmission_fluid_level_on_a_2016_honda_cr_v.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/zabopiwodixadaxevirefod.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/language_leader_advanced_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/visio_for_dummies_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/swimming_pool_maintenance_guide_for_dummies.pdfIn PDF document text
    • http://jutagejefutix.atwebpages.com/libunokekile.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/wujeji.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/xupovokomej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e360e7b-30ab-4c5f-84f3-ff25af145a32/samsung_galaxy_note_4_battery_price_in_pakistan.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_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 5308 bytes
SHA-256: 730ab2c9e81933e856f2241b5b53722883bdc86534c6c47ad9d529ce78410118
font_01_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 11720 bytes
SHA-256: 98a8076d9c7ba431bf31b1bb0c369b6d881c86811de7fb7e205313efe78d1af8

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