Malicious PDF — malware analysis report

Static analysis result for SHA-256 9843bdd26b86e161…

MALICIOUS

PDF

74.0 KB Created: 2021-03-06 07:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d3a351a20d0957a706c0f1bca009a52 SHA-1: 53ff25bf904ae71c54e0ca1a1402f9182d1352c9 SHA-256: 9843bdd26b86e161a081c4f76b6369a57a0e171b3973fa7812a0d649aa7eb9c5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that mimics a worksheet answer key, suggesting a phishing or malware distribution lure. The presence of a PDF link farm heuristic and ClamAV detection further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • 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://dugedepap.ru/wix?keyword=dna+unit+review+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/jukowejazus/gwRhggd/88174366072.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/2hcYhgd/mario_kart_tournament_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/piwojosexaja/jjjjjjf/46634103774.pdfIn PDF document text
    • http://wumokejo.iblogger.org/social_identity_theory_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/gdk2gYT/dual_enrollment_meaning.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/libeganot/islamic_and_english_calendar_2018.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_ce118ecc9e44437f85699187104173d0.pdf?index=trueIn PDF document text
    • http://xedorub.rf.gd/69042369257.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/subway_sandwiches_bread_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/lemumupagudabok.pdfIn PDF document text
    • http://xavuguwibimovin.epizy.com/cost_accounting_question_paper_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/zotatupibixuzugomimaxaje.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_66cc45bd703c41948fdd24b670da548e.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_7af396219b6248329d02b556113c1bb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kofabube/cisco_cgnat_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/malayalam_calendar_2019_janmabhumi.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/what_are_always_abnormal_findings_on_a_pelvic_exam.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_70676f69d51547ce88f48b6f1cf13eb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/what_is_the_theme_of_the_book_percy_jackson_sea_of_monsters.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_916019fdef0a4a28a2bb95e680c220d5.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_9a96e80440f14b6f8914b1c9d03d23d1.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_a6c9f57c8c4645ef8932b9afbe68f01c.pdf?index=trueIn PDF document text
    • http://dafunidubavilo.rf.gd/13579123240.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_97a1ba25c37144bfa5602fe1655c1cdf.pdf?index=trueIn PDF document text
    • http://febiked.rf.gd/51268988064.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_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 4940 bytes
SHA-256: 76da5d411c9795d5728bb69f37a48db3779c34588ee77b486493a000449b82c6
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10032 bytes
SHA-256: c12e02c1d27e6d21598c80793235e582b1292d3062da092ae0d508fd0cdf5963
font_02_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176