Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1e63ed29da65a8…

MALICIOUS

PDF

78.6 KB Created: 2021-05-25 07:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c965735b462f00f62ffe7e51a689e62e SHA-1: 2e4946a6a6ef4c0031312da62331448d9f5bf78f SHA-256: 5e1e63ed29da65a802781058175074ddc04907d163bd37c177cbe11ee92c6127
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'librarian job interview questions'. This suggests a phishing or social engineering attempt to trick the user into visiting a malicious site. The presence of numerous other PDF links, many pointing to benign educational materials, indicates a potential link farm or SEO poisoning tactic to mask the malicious URL. No scripts were extracted, but the primary malicious behavior is the redirection to the identified malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=librarian+job+interview+questions+and+answers+pdf In PDF document text
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/686823.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/2461452.pdfIn PDF document text
    • https://juguxusomusivu.weebly.com/uploads/1/3/5/3/135327365/jitagiletaf-zotik-jeperoge-mavoz.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/pajuperufaketavavox.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/dalava/fundamentals_of_heat_and_mass_transfer_bergman_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/approaches_to_international_relations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be3bfd7-a060-4748-9bc8-a349d99fc34a/how_to_use_elite_gourmet_air_fryer.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/palm_leaves_coloring_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/barishan_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/tanaxudivabuzanovusuj.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/interior_angle_of_regular_polygon_with_14_sides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77636948-0749-4c4d-a788-aa3743413708/take_the_official_myers_briggs_personality_test_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e99623-b70c-4376-935c-bff86de00d8a/molozijurar.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/quell_smoke_alarm_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115ded5a-606b-46d5-ac15-dac67e6ee727/zakigigisokefip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c2c745-a88f-467d-a355-7b568012145e/what_motivates_you_daily.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/wahl_replacement_blade_set_wa2559.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_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 5436 bytes
SHA-256: 405c5dcb76c9017d951efa8828b2927f1644e00100187c2d36881099d1775640
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10268 bytes
SHA-256: 545d08a4ae2595556dee6585c06963a24e081c5c141e5263fe33e99d2bdab25e

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