Malicious PDF — malware analysis report

Static analysis result for SHA-256 de32fc18731a8f4b…

MALICIOUS

PDF

79.7 KB Created: 2021-04-15 13:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 470a91a0a230c2412df6f4388ac9932e SHA-1: 70d8243886d6c7892e41dfa5029cc424658ae6c3 SHA-256: de32fc18731a8f4b759ac5de73c9b80e56fdad3769b3e566710896fabdbc1ad1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a strong indicator of phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were extracted, the embedded URL is the primary indicator of compromise, likely leading to a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/strik?utm_term=jeep+cherokee+trailhawk+transmission+problems+2016 In PDF document text
    • http://optamorem.com/1353785207wgzvl.pdfIn PDF document text
    • http://mibijuzorifif.getenjoyment.net/53094691589.pdfIn PDF document text
    • http://peteferix.mypressonline.com/roturufajebefukuluxi.pdfIn PDF document text
    • http://fullstacket.online/voxatixapufaxuxiwebud8fhrh.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/wavatarufotalozun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonegexunu.myartsonline.com/24723591826.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_f7283391e1314381bb2b200f124d6d3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/alphabet_writing_practice_worksheets.pdfIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_e3af3c9cbae3433a9313eed578535dcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/fimodobukomowunodo.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/activinspire_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/android_app_to_add_text_to.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_e7869c0415634d6e94b734fd0f5951ab.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_1a247a487c134a64822646e8b7addd9e.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_595f45038168413d8d2130feece64aa3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/stopping_by_woods_on_a_snowy_evening_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8cf266e-14e6-4c7b-ad92-fa8d22acdcd5/80049439426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7d925f-3d3b-4629-be2e-02c09f972afb/49713498145.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_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 5936 bytes
SHA-256: fa167b337f751c1ea68d1a04f8d64cfd7f646f2d4b0d2549450c90566b49f1d3
font_01_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 10464 bytes
SHA-256: 01ab89559575de27c8b6eaf51d9d074bde833c8359bb62584468ae4bfb685da1

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