Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fddb06f0711aa72…

MALICIOUS

PDF

80.0 KB Created: 2021-04-11 13:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 402c4abf8535f0b57bb053dfc9a2991f SHA-1: 5325f8ab96f5e6eabcf9e71358ab671445b14410 SHA-256: 9fddb06f0711aa72c6815f2a1db75dc392082a99f33e9b591cce5041318b5a3f
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 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=ready+to+use+excel+formulas+pdf PDF link annotation
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/90fec2abe46e032.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/5304815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449185/normal_5fda12d64bc0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424361/normal_5fcf3dfa54939.pdfIn PDF document text
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/2ee704063ef73d.pdfIn PDF document text
    • https://sepefawepuvikex.weebly.com/uploads/1/3/5/3/135384525/8db9e43a4d9201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_6066da60de54e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5fe573b570374.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/35997474330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_6031063fcc925.pdfIn PDF document text
    • http://pofuxujeku.iblogger.org/9769829776.pdfIn PDF document text
    • http://didavixakodix.22web.org/what_size_battery_for_craftsman_riding_mower.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/calendrio_mensal_2020_portugal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenezipulugiji.atwebpages.com/30609547532.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/how_do_you_type_cubed_on_a_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/yakuza_kiwami_pocket_circuit_guide_champion_cup.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/binance_launchpad_guide.pdfIn PDF document text
    • http://towuvoti.epizy.com/plane_wallpaper_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/65799748181.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/wedidunotolo.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/dijusigupanirarudasifere.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/jiroputiduzamotepusiguk.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/75508740056.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/beginners_guide_to_social_media_platforms.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/vavifulekewoneg.pdfIn PDF document text
    • http://folavoxisunul.rf.gd/acer_aspire_v5-431_bios_setup.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_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 5476 bytes
SHA-256: 27f78a10805a03cc29656ff314cd1be5b860fc3501906f0513ff1e47eadf3dac
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 11888 bytes
SHA-256: 0c6af218f673fc933ea5846115e0a603bd19cd7376c9c82341928c9377bf05f8

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