Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e50cae4b05ced8…

MALICIOUS

PDF

81.0 KB Created: 2021-03-19 23:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77744f898db8025ed5ee658307b980b6 SHA-1: b73e4f974bb73f3c4171a58e06c0fb7c6112fc3c SHA-256: d7e50cae4b05ced87c90bc7576aa9766bbfbe52e176afa330134595d68c9bfef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://pelibifir.ru/award?keyword=entrepreneurship+development+pdf+2020', is directly embedded in the document. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=entrepreneurship+development+pdf+2020
    • http://impergamon.com/algebra_lineal_ejercicios_resueltos_numeros_complejos282eh.pdf
    • http://siviveko.getenjoyment.net/25278800968.pdf
    • http://realwockyc.info/gobifoze06j7h.pdf
    • http://mastera-saydinga.ru/gekirafixosetavadrikj.pdf
    • http://nigigalewo.iblogger.org/youtrack_android_app.pdf
    • http://murupewobot.iblogger.org/1240329923.pdf
    • http://ig-support-service.com/what_does_it_mean_sub_zerowdxc9.pdf
    • http://ripugusulufiluj.getenjoyment.net/apigee_training.pdf
    • http://form-lnstagramverifiedbadges.com/common_core_math_problem_solving_4th_grademe96v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tonemakopinibem/47299714848.pdf
    • https://8e75e8be-0f37-480b-85ac-641553c1acf9.filesusr.com/ugd/a4a1ce_960bfcc2c8f04470885645b9f8dafe67.pdf?index=true
    • http://sesilav.rf.gd/bible_journaling_printables.pdf
    • https://s3.amazonaws.com/wakuzidi/23886275852.pdf
    • https://s3.amazonaws.com/fobupojowojon/infotech_fourth_edition_answer_key.pdf
    • http://xafuvarajuxeg.epizy.com/wubax.pdf
    • https://s3.amazonaws.com/jifesu/pharmaceutical_biochemistry_books_free.pdf
    • https://s3.amazonaws.com/xijalovelokolep/54188609610.pdf
    • http://pepajefosub.epizy.com/byomkesh_bakshi_episodes_free.pdf
    • http://tonorepunad.myartsonline.com/atopic_dermatitis_patient_education.pdf
    • https://s3.amazonaws.com/nazekisigiduz/endocrinology_guidelines_thyroid.pdf
    • https://s3.amazonaws.com/ropidadegaxut/78463376495.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_04801670367f47cbb9fc067da5719bce.pdf?index=true
    • https://s3.amazonaws.com/kumasala/zezasejobupojamolosewesa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001c.bin
89e5dca0aa829e8333ef62c67e4c947e39d852c10159cdf82cc299ac5601f7f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 5360 bytes
font_01_sfnt_off0001123e.bin
a6ae17f59a7ad2548ebc39fdac0cd06604aeb07e1321fe11d9f75c077e84b62f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 10684 bytes