Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa1c894f0e9d7be…

MALICIOUS

PDF

81.9 KB Created: 2021-04-04 10:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 95a747da34573d4302298f7a37e1e87c SHA-1: 81620941ef451957893d4468fb2033da58dfcf64 SHA-256: 2aa1c894f0e9d7bebbc8e7a20b1640f9cfbdfcc469d235b51d1f6e3e36d67e12
186 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. 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.
  • 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://nipisod.ru/strik?utm_term=auto+fundamentals+12th+edition+workbook+answer+key PDF link annotation
    • http://pavajevubuj.iblogger.org/lefatikerupikumadigiseg.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/56083235033.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/ninabuvufezolujudekuzodos.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/gicifgf/finefube.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamijiti/edeYsjb/60172406200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f663a66-3106-4918-ac6d-dbb4ee37860a/sentinel_deluxe_22_revolver_r-107_parts.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_c883aff7f8c84e64ac03df92d22e4115.pdf?index=trueIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_7ff925b13ea24b77874e6ba6c6be1e77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7cc621-477b-435e-a420-f24f86d0949b/physical_science_grade_10_2018_memorandum.pdfIn PDF document text
    • http://tagejenetel.rf.gd/koxotasosogenozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41dca4e2-d65d-4414-966c-367b5655c760/dunkin_donuts_glazed_donut_nutrition_info.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_abb81f2c0b4c47a483667cf63e25911c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ccd2f3-8151-42f3-8c63-061271ee0b7c/voteraruranikubigijuputo.pdfIn PDF document text
    • http://ximevenekitag.rf.gd/baby_onesie_template_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502c1d01-165d-4515-8ea0-00cd805bdf86/amazon_presto_profry_deep_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88596505-1697-4b14-947f-8aa225657783/how_to_program_a_hampton_bay_fan_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4f0999-90bf-44f5-97e1-9d09f2e1aba6/88567039067.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_24eb02be30ab47e0b522501535dd626b.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_d218f1c4d0c345eba38c14673b69a96d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03133dee-bdbe-462d-9018-e425a4b751ab/scotts_riding_lawn_mower_17hp_42_belt_diagram.pdfIn PDF document text
    • http://ziwutaje.epizy.com/whistle_for_the_choir_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b7f948-2ca6-44e6-9349-f5440cbef54f/rexerozexi.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_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 5720 bytes
SHA-256: d704df7dfe60726e7c170f9c0d4002f12da0bd2b24d4d2a2d4b96300e1c83683
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 11240 bytes
SHA-256: 084a82d4edac8e65c8676014df4b14e4cec52d1d4f650fee012138594d06e88d