Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23d3f386e31a85f…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 22:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6cf4d0c8751b293f8942f0602a7fcc96 SHA-1: 808e5c72972bf66ad9f412f2e546e4baf0a7ec35 SHA-256: c23d3f386e31a85fd07d4d18dfb591e2823378e03b67cb37af84b08aab36d376
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, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains a search query related to 'ipod nano', which could be part of a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=can+you+still+buy+an+ipod+nano PDF link annotation
    • http://gavediteriremuv.medianewsonline.com/86650373943.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/iigeggF/12780287163.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/jhhbiiF/ridopukuvemoso.pdfIn PDF document text
    • http://laithub.pro/call_of_duty_cold_war_update_1.05_patch_notesevg3k.pdfIn PDF document text
    • http://verifiedbadges-form.com/86992086995rz8td.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/why_my_acer_tablet_wont_turn_on.pdfIn PDF document text
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/vajugikokufutida.pdfIn PDF document text
    • http://generatorsale.ru/top_10_country_songs_of_all_time_youtubepyzjx.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/2b43878c.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/ibPxW8X/gafadi.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/5457456.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://uploads.strikinglycdn.com/files/0bf25d65-4b60-43a3-a79b-e4458538ca35/jelamozulokaveluzab.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/49601679619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9892fe-e03b-452a-9224-6774c6861070/joxexitatoxuxuvej.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/wijukazix.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/46716831131.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/cesarean_dictation_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7d42d3-56c2-436e-8464-91135b28cfb1/koriwogutadebevorema.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/a_level_physics_electricity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb90d7d2-51b0-4b55-be26-bcbe22deeb0c/how_to_start_a_yoga_sequence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2096b6-6ade-4f2f-b8ac-8b40387f8153/harry_potter_read_aloud_book_1_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/guidelines_urine_sample_from_catheter.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_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 4884 bytes
SHA-256: c80cfe6ee2a48e58b8c08470ee74c013f17728c9d76d801a32619a06c9ef3e2e
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10740 bytes
SHA-256: 3bb2b26e5b7e4e388dbfd6dcf277cebca267ac9399912e380b695e20fd179281
font_02_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e