Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e39f936e4073b2…

MALICIOUS

PDF

150.2 KB Created: 2021-03-15 19:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 05255203dee4ecb0a8e4d9b0794f34a5 SHA-1: a19bccaa7b039c5fb597f504919eee65bdfe3ab4 SHA-256: 78e39f936e4073b25e565c535e5dee41e84918de53904ed692cccdb2cd6fcded
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains keywords like 'bossypants pdf drive' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure. The presence of numerous links to disposable hosting further supports a link farm or phishing attack pattern. No scripts were extracted, but the overall structure and URL analysis strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://yafferge.ru/award?keyword=bossypants+pdf+drive In PDF document text
    • http://rubyshup.space/77287522967r7zl0.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/9692536.pdfIn PDF document text
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/1375872.pdfIn PDF document text
    • http://eurofamily.pro/6015073368phlj8.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/jbib458/super_soccer_champs_2019_apk_vip.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/kitilufudujadowi.pdfIn PDF document text
    • http://sosed.market/96273952937wq5vi.pdfIn PDF document text
    • https://vazaratel.weebly.com/uploads/1/3/4/0/134017227/zazufeker.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/garosajem_gitoboxafe_tabuwag_dagufikizo.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/gHcehaw/12319077633.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd76b585-90c0-4569-9d03-73c42b377392/xepufiwijatizotuv.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_43e8b703e00047b0b33a18d9167ad61d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b93a2b-97a8-4067-b042-34c3d39c2845/are_there_any_adverbs_that_dont_end_in_ly.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_52c23e81c5bc4cdba897729b8028323d.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_3a5b2592afbf46a4a085a560052a7d77.pdf?index=trueIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_d4a02d5969174c5c9ddcbcf4221d5811.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_b7c1ee71766c4d8f917f651412d0c8b8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2118E 5216 bytes
SHA-256: ccd1fab7c651f23b5f1ccec7ead89505cdbcf5b2d5a2ec9cd8812c2bdd08f276
font_01_sfnt_off0002236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2236E 12084 bytes
SHA-256: 50cbb4f17e276cb0626c26aced99cc37dfc0a8ab4f8c202e9cd1133e4fee9c47

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