Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd21b012220671c9…

MALICIOUS

PDF

83.2 KB Created: 2021-03-21 00:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e6275501007378e8f26c02b4631bb992 SHA-1: b1473bbf1491f9e750a8ee0d5835d6635458e935 SHA-256: bd21b012220671c9a32291374a647fe6c7e3ed5fc18a092cd4e4a957106c8398
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://baarspo.ru/award?keyword=data+acquisition+and+processing+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420039/normal_5fe0719ff3749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5ff01f2a73d93.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/rofusasanozibugatozi.pdfIn PDF document text
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/5868065.pdfIn PDF document text
    • https://pevivifigevesiw.weebly.com/uploads/1/3/5/3/135315965/2438683.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/Egchkw5/the_advisors_alliance_ep_9_eng_sub.pdfIn PDF document text
    • http://vixurefivero.66ghz.com/how_to_use_travel_smart_conair_luggage_scale.pdfIn PDF document text
    • http://gasixozetol.22web.org/treble_clef_notes_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/sapidefapo/7nJbaZj/speed_night_2_game_download.pdfIn PDF document text
    • https://pimesawugure.weebly.com/uploads/1/3/0/7/130776266/jixevirorubifif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_6047a84e223ff.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
    • http://fejobizife.epizy.com/67688194405.pdfIn PDF document text
    • http://roveramo.atwebpages.com/damajarivifibez.pdfIn PDF document text
    • http://zatozisuxaxabiw.rf.gd/16692068833.pdfIn PDF document text
    • http://reloroxegexe.epizy.com/probability_theory_and_examples_solutions_manual.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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5300 bytes
SHA-256: b648133a361ebca67b77dbd8f2f5209bb4a256b67620c66280e2b5aebaee94c3
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 10672 bytes
SHA-256: ae37c64bd7693d86cd09102c8d7564527e19aabba6c427a601b21704de87b20c
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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