Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca5a1eaac8dc184…

MALICIOUS

PDF

82.2 KB Created: 2020-11-18 16:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5e86e3bcb2ddee662b792dab00d299c7 SHA-1: d75c5050a078ab1ab895303f518a8dcde50f0d36 SHA-256: eca5a1eaac8dc1848a7ee4171068b31bc826a7d0314be5b6b8f8a6eb06773cc9
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 0.9997

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 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://traffine.ru/123?utm_term=simbolo+mayor+que+hacia+arriba PDF link annotation
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/2658506.pdfIn PDF document text
    • https://dumiwexadanona.weebly.com/uploads/1/3/4/5/134522913/fosenu-xofigafonerebaw-supak.pdfIn PDF document text
    • https://tatunuzaxu.weebly.com/uploads/1/3/4/5/134596213/3328202.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/zonebon/game_playerunknown_s_battleground_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/sagamuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080a4f14-2e93-45f1-90b8-68e1d1fd8c39/online_tournament_bracket_generator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/38740174792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf28a11-e16f-4f22-9e5a-2a87ab3327d9/blackjack_basic_strategy_chart_reddi.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/77485520446.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/jekegaviso.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/bohr_magneton.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/best_reader_windows_10_reddit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5332 bytes
SHA-256: b9e86ad3bf3fb2ed65ab5cdf398d9259e712351b286073f90cf23756d7cc0db3
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 14096 bytes
SHA-256: 72137d39c9caed9ff237056b0f7cacd6bcb96f1a677881a1fbe593197cf3172d
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 16076 bytes
SHA-256: bfd5fcdb7495bed175e4f51938194e2ecb7e505d90535bc2124716332a04a4ab

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