Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f74ac384aec8320…

MALICIOUS

PDF

101.4 KB Created: 2021-04-12 19:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b0566a40c66e46b2af0a2b74eacdfd07 SHA-1: 335a319c4afa8aba84c8431549be66d9514addda SHA-256: 7f74ac384aec832094ddd0d93e72d62e6fb0b6f0d6a8b2c1075c22adf15a8b06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a strong indicator of phishing or malware distribution. The ML classifier and ClamAV detection confirm its malicious nature. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=circling+irregular+verbs+worksheet+answer+key PDF link annotation
    • http://generalmassage.online/pabiv536wt.pdfIn PDF document text
    • http://bilkan.fun/how_long_is_navy_corpsman_schoolgogbd.pdfIn PDF document text
    • http://tulakijumipad.22web.org/42074236362.pdfIn PDF document text
    • http://prod-fruit.space/telovetebudatusvqnzo.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/wd_tv_live_hd_media_player_firmware_2.03_20857yv.pdfIn PDF document text
    • http://natfreshik.fun/definition_of_braillers8ns.pdfIn PDF document text
    • http://zafabido.22web.org/bekuvino.pdfIn PDF document text
    • http://canlisohbetim.net/74028816198ouncu.pdfIn PDF document text
    • http://instas.site/light_is_like_water_magical_realismpai7b.pdfIn PDF document text
    • http://devgame.design/raymarine_c120_screen_replacement29glb.pdfIn PDF document text
    • http://anarchymedya.com/716474549777qtcj.pdfIn PDF document text
    • http://svoydvalend.xyz/12353669506gsexf.pdfIn PDF document text
    • http://lifeeuro.info/7801451256ru4bd.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/38093165201avimm.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://whalesqpa.fun/65935956932g65vv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_c4429d08e67345ab8831b13b7ffe0725.pdf?index=trueIn PDF document text
    • http://pafuvoxepume.epizy.com/sejasekirod.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/pirenixezi.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/battlefield_4_highly_compressed_620mb.pdfIn PDF document text
    • http://susebuxusebug.epizy.com/70515268810.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_954c6d508ed048b2a347b423d98433d6.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_0f15685ae70d40188ad4ef4f71b3cd54.pdf?index=trueIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_696d8184309b4d44b03cc045d9c08896.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_38452bdd643f43d19a3410d6cb11096b.pdf?index=trueIn 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_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 5424 bytes
SHA-256: 7efbca92c5c65dd277b7cf698aacb59e8828d1566a45280f8fde150ad1f076df
font_01_sfnt_off00014f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F32 12936 bytes
SHA-256: 83851d825c7265b2f0853ec5eb455aaae5f7346dfa0b97c20241512f26590c7a
font_02_sfnt_off00017993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17993 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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