Malicious PDF — malware analysis report

Static analysis result for SHA-256 80de3d10171bfc96…

MALICIOUS

PDF

74.1 KB Created: 2021-03-08 15:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63e479514703dab2e5d61823ebe5b31f SHA-1: e27bc1695de396242db953561010a79e3eadb781 SHA-256: 80de3d10171bfc9625c9d3bbd58b44509912e0ed9e64a227712c7510439ef3ce
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/123?utm_term=avast+virus+database
    • http://palamuduto.iblogger.org/how_to_make_a_time_capsule_box.pdf
    • http://videohost.space/computer_networks_andrew_s._tanenbaum_pptmnzdc.pdf
    • https://cdn-cms.f-static.net/uploads/4490371/normal_602c3550e8286.pdf
    • https://static.s123-cdn-static.com/uploads/4450249/normal_5ff87e2f75121.pdf
    • http://medicalpracticementor.com/spirit_airlines_stock_ticker1iqz2.pdf
    • http://terem.space/8803680152yls20.pdf
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5ff97064bbfd9.pdf
    • https://cdn-cms.f-static.net/uploads/4531523/normal_6025ce7cf3ced.pdf
    • http://rimka.xyz/free_online_clarinet_sheet_music_for_beginners9oh0l.pdf
    • http://kluruu.info/588652307643spkr.pdf
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ff01fc0b1263.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kopivenegi.epizy.com/books_to_read_if_you_liked_the_bronze_horseman.pdf
    • http://dewabop.rf.gd/lord_of_the_flies_chapter_1-3_quiz_answers.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_c3bd68a4984b4502b36e76022012ef1b.pdf?index=true
    • http://sukidagijonola.rf.gd/jammu_university_ba_4th_semester_date_sheet.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_e10eb2c44e49419cb3f973c96216e51d.pdf?index=true
    • https://s3.amazonaws.com/xozeb/gba_emulator_android_ad_free.pdf
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_f865db940ef642289579b901bd4d7709.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_off0000e6c9.bin
96a0658e81f3801435a99f9cd72a762e9308499b9096eeab40a451b3a6e32158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 4976 bytes
font_01_sfnt_off0000f7c4.bin
19e280ac50ac9df734cb979c2237028ea97d814b62298c4e01c63573d44a3f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10476 bytes

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