Malicious PDF — malware analysis report

Static analysis result for SHA-256 6846551034a57016…

MALICIOUS

PDF

75.1 KB Created: 2021-05-15 18:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 92ab9fa6ea3bec96f81b9a2ef8411659 SHA-1: 22f0237f058ffc8da73e947ae65d9789fcf9af71 SHA-256: 6846551034a570166b25bddfa72ae0041eced94348c0b187f78fbcf8d8647865
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware distribution lure. The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or potentially malicious domains. The document body, though heavily obfuscated, contains text related to 'engineering circuit analysis', suggesting a pretext for the malicious links.

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://dafemum.ru/strik?utm_term=engineering+circuit+analysis+9th+edition In PDF document text
    • https://cdn.sqhk.co/giwibilawa/jgibQPi/mebemozumipazibegom.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/qhhhaia/xipepotoxumepawitawoj.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/is_no_game_no_life_light_novel_good.pdfIn PDF document text
    • https://sizuxemonip.weebly.com/uploads/1/3/4/3/134315948/b3d9d13e3e.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/c18db1a7ed4fdc.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/2162353.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/7000256.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/math_word_problems_2nd_grade_online.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/xadadimifide-tefugakozika.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/bsc_biotechnology_syllabus_osmania_university.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/7221865.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/8509123.pdfIn PDF document text
    • https://cdn.sqhk.co/suzagofi/iidggjc/50583262699.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/wnyc_schedule.pdfIn PDF document text
    • 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
    • https://s3.amazonaws.com/kexamoxusinixu/4643903263.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/74798120399.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/17825934614.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/nba_street_basketball_game.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 5296 bytes
SHA-256: 80c1023e5f80c5892168d74fb77298a2a538f5aee2476274060d8cf3de6fa48e
font_01_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 11308 bytes
SHA-256: 7bce84f1be3e2438dc38ddbe3c049fa6da28e92ee0cae86b196f9a0d676d6bc7
font_02_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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