Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5850f9be94f3a5…

MALICIOUS

PDF

87.3 KB Created: 2021-03-23 04:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c1fb8dd26a60a006c4217f59cc7d312c SHA-1: 9041aef99e5ac21195b3d5e5429c012adeccff87 SHA-256: ba5850f9be94f3a5e14c3abe9cbb57261f478dbf636c382d4d359951917301c1
146 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. 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 0.9993

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/wix?keyword=10+ft+galvanized+fence+post+square PDF link annotation
    • http://pozesex.iblogger.org/jumifor.pdfIn PDF document text
    • http://aov.one/zenulotazaoxxjb.pdfIn PDF document text
    • http://kexejadupuna.66ghz.com/hyatt_regency_walkway_collapse_report.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/A2gdjgf/end_of_game_2_warriors_vs_blazers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_6056e655a1009.pdfIn PDF document text
    • http://erogancolumbia.site/wukubekuvuragunejunodidkrlf5.pdfIn PDF document text
    • http://teksalle.xyz/kitupezepabarejagumor9svzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5fd89cd4b9922.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/eKwCyjh/piano_keyboards_games.pdfIn PDF document text
    • http://timurberg.ru/lenovo_t420_battery_replacement7hj55.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/9LjdG29/air_control_valve_price.pdfIn PDF document text
    • https://cdn.sqhk.co/nudizodi/ogcYbgd/2_player_games_sports_heads_basketball_unblocked.pdfIn PDF document text
    • http://romeoplanet.club/no-nonsense_algebra_2nd_edition33efn.pdfIn PDF document text
    • http://gadosamu.iblogger.org/186559859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_604fb65708e1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fee62ee0c4f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fec050200c98.pdfIn PDF document text
    • http://jobware.pro/song_of_solomon_toni_morrison_chapter_summaryzv5hz.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/39agfhe/wixowigolevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijularof.epizy.com/xujitekofovorisaxojaludo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2dfe803-e97b-4834-81e4-4074587dc3f3/81775209737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4fbfba-1309-4c31-840e-4e49dbe8829d/how_many_different_types_of_cdl_endorsements_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f2df64-48b9-4f77-8335-98482ebe49e0/lezowav.pdfIn PDF document text
    • http://buwebone.epizy.com/21386144329.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_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 5656 bytes
SHA-256: 82bc82e5683232ae7da3c999b83b4ca5a498ecc4ce510a14627d5395d68793d1
font_01_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 12784 bytes
SHA-256: e72f8aec0c43b004bcb447e74d6497ad17f6f8b80524642c58828db20c99bde1

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