Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5840db4f777e59…

MALICIOUS

PDF

88.6 KB Created: 2021-04-02 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1311832edf55a4aa9966e57acff8bac5 SHA-1: ef7f8b43ffd6a22346a83bb0e254efd9a6dd7e6e SHA-256: ff5840db4f777e598f9de12a6aabf078e0b480704ef297c44138fdae54d84e61
176 Risk Score

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. It uses a callback-phone (TOAD) lure. 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 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/strik?utm_term=brinkmann+gourmet+charcoal+smoker+and+grill PDF link annotation
    • https://cdn.sqhk.co/dasotipamu/gH2jeje/street_fighter_iv_hd_apk_obb.pdfIn PDF document text
    • http://promoocaoameericanas.com/58598233225tlosi.pdfIn PDF document text
    • http://misstourist.info/genimipavemodoli5cg6t.pdfIn PDF document text
    • https://cdn.sqhk.co/tifozeborot/cbsWQ5l/the_sims_freeplay_hack_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/jgfijW8/weekend_getaways_in_texas_in_november.pdfIn PDF document text
    • https://xununurolaweb.weebly.com/uploads/1/3/4/6/134673503/afd4d0.pdfIn PDF document text
    • http://boost-shop.xyz/88387394218zjqer.pdfIn PDF document text
    • https://bodakipufasedoj.weebly.com/uploads/1/3/5/9/135972884/e61c5bc8.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/jhgfKQw/86865782967.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/iex94aQ/34404007810.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/hefgehd/sizes_of_yellow_cab_pizza.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/jjftQjb/multiple_monitor_setup_hdmi.pdfIn PDF document text
    • https://cdn.sqhk.co/pulobegefuzi/Ghgcche/government_application_forms.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/nutanigonu/pitiwukumeb.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/target_clearance_king_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/78395628250.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/48778936657.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/zisatosogavakiba.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/4977134858.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 2872 bytes
SHA-256: 3ff69c71d66184b83857fcaf5af60dfcc2c1fae9fd7aa3bb356c11b180316f77
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 5468 bytes
SHA-256: 8551f1a2ef7b3cfde19a96e427543b6f8ec58472ffa091a9fc6c1812419dafd1
font_02_sfnt_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 11112 bytes
SHA-256: cb0c97f523f9ba585e3d9fe5b84df6717aea7163f4950708968ecf9cc8a1c31d

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