Malicious PDF — malware analysis report

Static analysis result for SHA-256 557fb1ab99379e4c…

MALICIOUS

PDF

74.8 KB Created: 2021-05-08 15:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e30dbef8ef1855e90029ffad0fd9bf41 SHA-1: b2e39c31d3c6d75c96527af0a09761272d240568 SHA-256: 557fb1ab99379e4c12bf2a088825df372e2511e1f4599e9cfe96a2c9d7dcccd7
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 0.9996

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://fokemale.ru/strik?utm_term=what+does+temporary+employment+agency+mean PDF link annotation
    • https://cdn.sqhk.co/bogonelemid/ggjbicg/rokonezunafidufanazosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_5fdad2253bb2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_6007edfd95eec.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/hchh1jc/80425808236.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/ij0jiUJ/worms_3d_gamecube_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/6gicjaP/dunk_tank_flyer_template.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/TOjgdja/skyrock_radio_station.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_600737dbc9b9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5fdce9521886d.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/mifui4c/crossy_road_game_download_for_android.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/nelizenejakarug/4421914364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba98601-958e-4bd6-b912-9960c833082c/20515274394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f227fd44-32da-4fa9-8697-9a4347db5593/93540430267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8b2878-dd43-486e-b11f-dbe9ee219217/federal_express_and_international_business_machines_ibm_are_examples_of.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/21194167170.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/hhkb_dip_switch_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/best_single_brew_k_cup_coffee_maker.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_f7d99e4d422b4822bbca44e84683e087.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd7a261-37d7-4b5f-935f-093533caac14/echo_srm_230_repair_manual.pdfIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_c359b43a781c40a2a34a5ed99f3f4770.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/nekutadajape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa61ca7-0d78-491f-aeea-bc69c84eaa25/67958235809.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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 5600 bytes
SHA-256: 82e6af06f6e29ba5827c0f68ea68b264bce611fcc79c0b9c52f51cad1cc81429
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 10648 bytes
SHA-256: ecf87a903fac24d93ba97e741a7fb5108b60eec9e4f4789a9165373e20278712

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