Malicious PDF — malware analysis report

Static analysis result for SHA-256 4867a98735c69040…

MALICIOUS

PDF

84.7 KB Created: 2021-04-11 13:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185385e947520aba2a78905259e4378a SHA-1: 471b2a26ebc60e02fa9bee37421110cca7d33abb SHA-256: 4867a98735c690404b4b5951f4e0d8202e0f16bf0e8eca02d457effd2e34f8b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a driver download URL for an HP printer, suggesting a phishing or malware distribution lure. The presence of ClamAV detection and ML classification as malicious, along with a high number of embedded links, strongly indicates malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nipisod.ru/strik?utm_term=hp+deskjet+ink+advantage+2545+drivers+download+link
    • https://cdn-cms.f-static.net/uploads/4478687/normal_604b081c5b5ac.pdf
    • https://cdn.sqhk.co/pinofizulag/igdhjjb/sports_trading_card_photoshop_template.pdf
    • https://cdn.sqhk.co/suwuwewazaka/diiqhbZ/87769019165.pdf
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fee1f4795a11.pdf
    • https://cdn.sqhk.co/sotisajen/cKKjggS/coda_definition_music.pdf
    • https://cdn-cms.f-static.net/uploads/4469351/normal_606e849e600ea.pdf
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fc7d8ef37e0c.pdf
    • https://cdn.sqhk.co/xenivoronizu/mwhdhi7/mojewegogirojasova.pdf
    • https://cdn.sqhk.co/bozogekeji/r1iczJY/rules_of_survival_apk_data_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4496580/normal_603c19bf1f866.pdf
    • https://cdn.sqhk.co/gogerazina/Fh9Mhez/royal_enfield_himalayan_brochure.pdf
    • https://cdn-cms.f-static.net/uploads/4381759/normal_60445d54ebd5e.pdf
    • https://cdn.sqhk.co/ludukuni/Vaahdal/the_best_pick_up_truck_uk.pdf
    • https://cdn.sqhk.co/buganixezu/hdOCchg/english_ttf_fonts_free_for_android.pdf
    • https://cdn-cms.f-static.net/uploads/4486987/normal_602593a323df9.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xilasisefi/milan_italy_map.pdf
    • https://s3.amazonaws.com/kesumasaka/evaluation_form_template_for_group_work.pdf
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_10967fa31a504f2998668d46347371bb.pdf?index=true
    • https://s3.amazonaws.com/tobovunoberiki/scikit_learn_is_a_machine_learning_python_package._true_false.pdf
    • https://s3.amazonaws.com/dobesogum/the_revenant_movie_awards.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_bb749e9860364129a47b1592637608c7.pdf?index=true
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_b389101809ee48b1b09930c22d46c65d.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_6e21a28e05414896b4d68c0754aa97c8.pdf?index=true
    • https://s3.amazonaws.com/kagedatabujo/xesaseretuduxagukotem.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_off000102f6.bin
c47328b99d1a8106722297ddf3976446a0c29354b3be907203f77db8ad888c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 1684 bytes
font_01_sfnt_off00010b5b.bin
f023aac12fc74ba05be4264010bdc36e9288cffd17b28276cb2b0201bfc45c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 5724 bytes
font_02_sfnt_off00011f11.bin
43ad2a7d028b988dd0964dc7cc5ddc5e68a1a0da27d2e74eba25306b421fd773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 11036 bytes

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