Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f5a225e5a4d12a…

MALICIOUS

PDF

276.6 KB Created: 2021-06-08 20:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 69b6790b11e4cf5379a482245e0aa36a SHA-1: 400cdc126fd4020cb08771c28776227b4faa77da SHA-256: b8f5a225e5a4d12a9e2ec22cdb6d99825c1684c6926bd5d4f56882db3d24984d
194 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of malicious links is sufficient evidence for a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/123?utm_term=public+speaking+pdf+notes In PDF document text
    • https://sofubozunorupid.weebly.com/uploads/1/3/4/6/134668483/bumulegetizabifixige.pdfIn PDF document text
    • https://rediwikutine.weebly.com/uploads/1/3/4/0/134096605/2956029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367621/normal_5ff1150941ebd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444648/normal_60b07eed6e203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_6039794c79e77.pdfIn PDF document text
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/vubezizise_rakawukivix_juguduketu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60268ea82267b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_6047f2cd42405.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/vejezenikozejupenase.pdfIn PDF document text
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/bivubutabu_fizuz.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/af20095a-c292-4f31-88a8-06116cf61828/bamudadomoxamivuluvewadi.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/what_is_the_relationship_between_empirical_and_molecular_formula.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144439386/forex_trading_tips_secrets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4cf088-8fde-4a45-92c4-5a5e75bb284d/im_essentials_text_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b19bd35-d0e0-44a5-8108-f0aa5432ea8e/71853659799.pdfIn PDF document text
    • http://xuladejuzor.pbworks.com/f/meditation_for_beginners_book.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/69128445674.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144422328/anamorphic_lens_flare_plugin_fcpx.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144751905/68583336116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbbf4b7-db86-4209-a81f-40310f076583/what_is_the_role_of_an_educational_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b4f4df-a1f7-407f-8d1a-4112ee47f671/software_development_engineer_amazon_interview.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/how_to_calibrate_maytag_bravos_mct_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0698732f-07cb-47c1-920b-a2c4def923ca/how_to_unclog_a_mobile_home_kitchen_sink.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144572280/finding_complementary_and_supplementary_angles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e43118d2-1842-416a-9507-be4b69f5b251/portfolio_landscape_lighting_replacement_parts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E80E 5312 bytes
SHA-256: b7590e59a11fa3477a9470fa7a9977eda2f8fac7976340fdd638a3871b34fa5b
font_01_sfnt_off0003fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FA23 11000 bytes
SHA-256: 606af408bd3555a1d5e838164c0768d2c4576e3224a90ab7c78b356478f4fbc1
font_02_sfnt_off00041fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41FE4 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00043512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43512 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2