Malicious PDF — malware analysis report

Static analysis result for SHA-256 063042c689dbb2ab…

MALICIOUS

PDF

79.4 KB Created: 2021-06-01 02:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ccfadafb9574c5bfba64b109a5cb4d8 SHA-1: d0b3b098d2447edccaedb7b94878595c2ba1df6c SHA-256: 063042c689dbb2ab58dd414b353515c66b090725860c1ccb3b0ed2465817782e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or distribution network. The document body, though heavily obfuscated, contains text related to business analyst interview questions, which is likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/pbw?utm_term=what+are+the+interview+questions+for+business+analyst
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/puvurolerofim-piraturuge-xilex.pdf
    • https://tovoginimu.weebly.com/uploads/1/3/4/3/134379987/8727996.pdf
    • https://leladuginaxiwo.weebly.com/uploads/1/3/5/3/135320554/ad57f55d.pdf
    • https://wilogodomagifaw.weebly.com/uploads/1/3/4/7/134727865/legoziz.pdf
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5fce206511cb9.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_603ebf9a2fca0.pdf
    • https://cdn-cms.f-static.net/uploads/4410953/normal_605fdea44f008.pdf
    • https://disepijov.weebly.com/uploads/1/3/1/4/131438002/wutobazuv.pdf
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/vofedo.pdf
    • https://cdn-cms.f-static.net/uploads/4425227/normal_6019237a7951e.pdf
    • https://cdn-cms.f-static.net/uploads/4423750/normal_601fc3625db46.pdf
    • https://gunevutatute.weebly.com/uploads/1/3/4/3/134361501/dubevaxuvobej-mopetagekiwep-judebij.pdf
    • https://static.s123-cdn-static-d.com/uploads/4471235/normal_60b574ccac283.pdf
    • https://cdn-cms.f-static.net/uploads/4376606/normal_606e578411192.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bd134239-8c9c-49c6-8fd5-c6841a32c0ef/holt_handbook_answer_key_third_course.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144418173/yds_publishing_deneme.pdf
    • https://uploads.strikinglycdn.com/files/cc9bdde9-2dd0-4ad3-b068-b9327de96aaa/cursos_de_ingles_en_houston_economicos.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144427743/can_you_download_fortnite_on_a_macbook_air.pdf
    • https://uploads.strikinglycdn.com/files/eca5e592-2e64-43a3-8301-7ecbdefdb715/write_a_one_page_reflection_paper_about_the_lesson_about_the_parable_of_moth.pdf
    • https://uploads.strikinglycdn.com/files/f302a11f-4f49-4656-b77f-b04f317dc339/valalofepaxewiforuz.pdf
    • https://uploads.strikinglycdn.com/files/a158806e-fc0e-4ade-854e-baa9cba1e268/steve_jobs_the_man_who_thought_different_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf8.bin
3a0dfb849aadd1badf74abce10d77a7b0c48fe3b818aa025d71c19abdd4028b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 5272 bytes
font_01_sfnt_off0000fdfe.bin
5062acbb30cc32ac26e5633fe9fbb55b5bbe4ada8fb9767fd5736f92902b7b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10584 bytes
font_02_sfnt_off000121ec.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 4324 bytes