Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7069d5c7ca3a72…

MALICIOUS

PDF

77.3 KB Created: 2021-03-25 00:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1036e0384aff69dfe3232fc5bb17fc8b SHA-1: 9df95761ef593519f815c1931bfba3355cdea07a SHA-256: eb7069d5c7ca3a72abd4c213b31c38878aea15482cd84bb09ddb02c08a8febf6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to link farms hosted on services like Weebly, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=adverb+clause+practice+pdf
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/rizawunawipofivovuz.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/4468382.pdf
    • https://kafunisizu.weebly.com/uploads/1/3/4/5/134599740/xelisazunona-kadut-dunuwib.pdf
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/virevorolovakod-risowa-vejopen.pdf
    • http://xutiwavu.iblogger.org/gidipefelowo.pdf
    • http://tedisesux.22web.org/oneplus_6_review_android_police.pdf
    • http://govovimifakine.mywebcommunity.org/chartered_accountant_cv.pdf
    • http://gagogepatajebe.medianewsonline.com/how_to_tell_if_flame_sensor_is_bad_on_furnace.pdf
    • https://cdn-cms.f-static.net/uploads/4495055/normal_603b906c23761.pdf
    • http://pexawegowe.mywebcommunity.org/blanching_vegetables.pdf
    • http://tuwukadinem.mygamesonline.org/delumaxupigisuwu.pdf
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/tubefuxuz_nikirimu.pdf
    • https://cdn-cms.f-static.net/uploads/4410717/normal_60482dda2383d.pdf
    • http://bufibinokurun.scienceontheweb.net/80703601372.pdf
    • http://xexapitanegis.getenjoyment.net/tivobojumugaduwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_f1fd93d136ff495f8b5ec69143df309b.pdf?index=true
    • http://nowageg.onlinewebshop.net/vowosirax.pdf
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_a327327eaac04485aa506cd8d37eafd1.pdf?index=true
    • http://zikoliduxa.atwebpages.com/58930043350.pdf
    • http://nejesezape.myartsonline.com/96735614920.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_fd531841d8224a819a46245e8cb4d297.pdf?index=true
    • http://mijikabetabup.rf.gd/jobs_and_occupations_vocabulary_exercises.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_3b892b02b1094d2a97ed3f64ebb0e283.pdf?index=true
    • 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_off0000f098.bin
8381767ffab8045c6200910285d1dd0a35f02b580eb594620a2fa7880e191acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5340 bytes
font_01_sfnt_off000102d2.bin
b1d831abf1b77234ac8c3e1faa9a679544f1b99b831149f61059f4fdd08622d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 10784 bytes

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