Malicious PDF — malware analysis report

Static analysis result for SHA-256 2275a063606a7c2a…

MALICIOUS

PDF

89.0 KB Created: 2021-04-01 04:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0202309edc1e3d1c1d8ed9083d3f6e93 SHA-1: 65fc0a864fcd45e8d66388456fb92a6671d33a0c SHA-256: 2275a063606a7c2af4a072a33bada73bd9b9709c3b2a3f20a701ffe399da394a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely used to host malicious content or redirect to phishing pages. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=autocad+lt+2015+offline+help PDF link annotation
    • http://tadurarawi.mypressonline.com/baucis_and_philemon_story.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5ff042f52539c.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/efmsqT4/suxikot.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/kitolaf.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/vivibejodamelujif.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/ichfhie/super_mario_world_snes_cheats.pdfIn PDF document text
    • http://afracheat6.xyz/vupajutznfxj.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/epieYhd/case_simulator_critical_ops.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/kNgggVF/96261813155.pdfIn PDF document text
    • http://help-violation.com/how_to_play_slash_chords_on_ukulele2azkt.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/32214245013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_60594477a2b77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fd039057f8b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwijiti.myartsonline.com/active_and_passive_voice_test_with_answers.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/cambridge_primary_english_activity_book_stage_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/android_apps_free_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/arithmetic_worksheets_ks1.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/sony_hdrcx240_lm_review.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 4032 bytes
SHA-256: 9440f71eefa4f59c7a71b16fb0b9f65724f2db68f71ee41650680a98f027c4b0
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 5408 bytes
SHA-256: 9da5e5da05eb0255ee7b3a5b37d5e98202c7aa94d2b1943021fa908a7453c88f
font_02_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 17116 bytes
SHA-256: 9c305593b72b18429ec0af6a2b790ddd4a7d8720d40eb8392878c585d59415f0

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