Malicious PDF — malware analysis report

Static analysis result for SHA-256 058ad255a5e9971a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 06:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279b5b2e4684f8fa143757169a02c0c6 SHA-1: 8053d07e148b286c374d828b8d1574e45e7a1962 SHA-256: 058ad255a5e9971a284ffba4fd0f20ce5dddebb868819356ab284c51bff33b90
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as educational materials, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/award?keyword=ncert+maths+textbook+pdf+class+12
    • https://cdn-cms.f-static.net/uploads/4479222/normal_5fe899266df89.pdf
    • http://kurs1.xyz/how_much_is_a_wii_u_at_walmartbp98w.pdf
    • https://dinurafilaxu.weebly.com/uploads/1/3/4/6/134621410/c52fd2.pdf
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/5936134.pdf
    • https://cdn-cms.f-static.net/uploads/4480399/normal_602cdcecdba3f.pdf
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/vowumevoselo-fotorebuli-momiravugimusos.pdf
    • http://makamar.tech/sidotawekonaruzuwiwm0xxe.pdf
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/gisoxididuki.pdf
    • https://rexajubimazon.weebly.com/uploads/1/3/4/8/134884463/tijorosidavi.pdf
    • https://ziralupaw.weebly.com/uploads/1/3/1/3/131379221/bujukaf.pdf
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/094f553d91d.pdf
    • https://cdn-cms.f-static.net/uploads/4379241/normal_6010894c2c8a8.pdf
    • https://static.s123-cdn-static.com/uploads/4488322/normal_5fc883c938498.pdf
    • http://zolomakowifop.iblogger.org/killer_instinct_super_nintendo_cinder_move_list.pdf
    • http://roflan.site/warcraft_3_canned_bread5gvqe.pdf
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/difurof_bepejivapi_wugiburivoloz.pdf
    • https://latiratigu.weebly.com/uploads/1/3/1/1/131164156/pekijagomutaf-lodaki.pdf
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5fcc9b847c6e2.pdf
    • http://priz24.site/how_to_draw_a_male_face_shapez16un.pdf
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/mokukitidi-botubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tipakixulo.rf.gd/haese_mathematics_grade_7_free.pdf
    • http://lapakak.rf.gd/sefisewomowapeduxonamu.pdf
    • https://uploads.strikinglycdn.com/files/b3143cf6-699a-4c4b-b2b4-80dc829f9165/79189478052.pdf
    • https://uploads.strikinglycdn.com/files/e3fcdace-5a7a-4f51-8046-18f11f0f7507/an_nawawi_40_hadith_arabic.pdf
    • http://tukudapig.epizy.com/tftp_server_cisco.pdf
    • http://vugozagiduzek.rf.gd/rolel.pdf
    • https://uploads.strikinglycdn.com/files/88205b58-fef0-416c-81e4-5d188b4fd2db/how_to_sell_salesperson.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f042.bin
e6159e8724d1c698e20549252d803a2342a80e7379667691062489c736b7c56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 5820 bytes
font_01_sfnt_off000103f5.bin
09e5602eee225630f5656c05a8fa8585065a163379d6250098593877d1dc4a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10816 bytes

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