Malicious PDF — malware analysis report

Static analysis result for SHA-256 848465c07227dc4c…

MALICIOUS

PDF

82.0 KB Created: 2021-04-12 00:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 989aacebd3d2fcbc17fbb509de812477 SHA-1: 176e4fc62278f01cbe6be9f4d90d9446c87e2f79 SHA-256: 848465c07227dc4c0031fedc0980cc480617a041beb647455179c9a9b90df4d4
166 Risk Score

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 0.9954

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
  • 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://crophysi.ru/strik?utm_term=danby+designer+mini+fridge+temperature+adjustment PDF link annotation
    • http://gelupulofevabek.medianewsonline.com/48601952779.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/96545252982.pdfIn PDF document text
    • http://pugalibapuf.iblogger.org/tulabetaledu.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/nizuzofakonosupuma.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/oXyjiNQ/15725950802.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/kedilexele/jQjeGjh/cara_call_of_duty_mobile_indonesia.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/96436430963.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/6gfdhbC/86144666805.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/A3hbjbu/european_history_crash_course.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/accidente_de_trabajo_y_enfermedad_profesional.pdfIn PDF document text
    • https://cdn.sqhk.co/lepapina/2qhgche/knife_dash_master_recensioni.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/american_girl_magazine.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/importance_of_ergonomics_in_the_workplace.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/nizuzofaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pajomer.epizy.com/fawosezizu.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/kuxepozozexaveleguni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814e908a-2f6b-47a2-ae92-fbd94e6220a5/ronitameredo.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/annotate_programmatically.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/50233736448.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/bootable_pendrive_cmd_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04290b5d-b144-46bf-8fa2-aad99e20db2a/stihl_battery_edger_review.pdfIn PDF document text
    • http://dipiwidafebezi.epizy.com/skyjack_3219_scissor_lift_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/pugolepi.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/tetanumi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/1134318939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da4208c-d7a4-4d88-af48-0f5cdb43806b/canon_mg2120_how_to_scan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 5416 bytes
SHA-256: e6eed767c638b935b139746bba85a875e36bd353f14a05cf4e64f4a63fd13874
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 12172 bytes
SHA-256: 625236524bcd7e3eb66b73b1748ba5c18c48bd779713680e72a600a0abe17f87
font_02_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71