Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef25ddcd3e18776…

MALICIOUS

PDF

88.8 KB Created: 2021-04-25 02:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f450baa628c9285c145c9da28dc7816b SHA-1: 5b29ffc26cbbe2de223b9a9a660d764239230552 SHA-256: 4ef25ddcd3e1877693ae2cb98bc787363515c04153c0602799aef0bc8220d850
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution 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 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://zajinet.ru/strik?utm_term=britax+boulevard+car+seat+expiry+date PDF link annotation
    • http://scrlt.xyz/12417757769e3pko.pdfIn PDF document text
    • http://habercigo.com/58863188272rx24p.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/xigjekE/idle_theme_park_tycoon_aqua_park_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/hicmdMP/simlife_life_simulator_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/jehjahd/63751760592.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/jgiBsij/38815265298.pdfIn PDF document text
    • http://fullcreditreport.info/7364237483kn0zp.pdfIn PDF document text
    • http://wukufulaz.22web.org/que_es_elasticidad_en_economia.pdfIn PDF document text
    • http://lifeit.pro/zilikonuzoburewubble.pdfIn PDF document text
    • http://gerujab.22web.org/technical_analysis_and_stock_market_profits_by_richard_schabacker.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/bofake/pagalilivolegenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53d9223-4e8e-4207-9c58-254ab970cee0/vagewoluveb.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/28821741336.pdfIn PDF document text
    • http://jikirukuda.rf.gd/black_dog_led_zeppelin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0814dfee-94a4-42c3-b2a9-f045308bdeed/xizolilozusib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e52ffb-d247-4325-b7d5-f0dbb744335f/41847269895.pdfIn macro / runtime command snippet
    • http://wirijabi.rf.gd/mijn_belastingdienst_aangifte_2017_en.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_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 5484 bytes
SHA-256: 0cbbeb28940194148fe9ff277e36ee2d1de3be39f7871791adc4cef94c33fc85
font_01_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 11296 bytes
SHA-256: f9b8ca24bc26d01b59d7b1418e55b693e4e600b0fbde2dbfd7f6543ea0522f71

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