Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb1b14c6e812050…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 18:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f894530c478bd3fcacd3ba2dc588f9f8 SHA-1: 2688f65e18406c34e639fa340ac8369b802a85e2 SHA-256: feb1b14c6e8120502354d98e72f18ee2f884eae3c109a73abc3b4e8ce88cd1f5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=endocrine+system+worksheet+high+school
    • http://xasujaru.22web.org/84903308406.pdf
    • https://cdn.sqhk.co/bapisolel/hjMgjb7/38394142250.pdf
    • https://cdn.sqhk.co/desogepupema/jdsja4A/short_disney_movie_quotes_about_life.pdf
    • https://cdn.sqhk.co/zubejavaxuvu/Qif6mjj/mountain_climbers_what_muscles_do_they_work.pdf
    • http://familyit.info/hp_8600_printhead_error_message9algy.pdf
    • https://cdn.sqhk.co/roretuduva/ihJhfgg/fegobubokiroxiribofu.pdf
    • http://hangzhoumetal.ru/how_to_measure_depth_in_perspective_drawingbzeqw.pdf
    • https://cdn.sqhk.co/zimopaji/evl7jfZ/vumidebixofutagogimixiv.pdf
    • http://qqkaxes.xyz/zijagisadewugefuw5csqo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbf7ab7f-6215-44dd-9d58-65fff80e6493/how_do_you_get_your_workkeys_results.pdf
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_723be616eb0043cfbe841976b7018f27.pdf?index=true
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_b564378132524505ba3bb783d34ec100.pdf?index=true
    • http://lezefivupeke.epizy.com/17067322605.pdf
    • https://s3.amazonaws.com/gonima/65415294140.pdf
    • https://uploads.strikinglycdn.com/files/3ecd996a-2f17-4b52-a549-d2f187aeb038/51140186067.pdf
    • https://s3.amazonaws.com/naxozelozude/durgai_amman_photos_free.pdf
    • http://zugujegezamuto.epizy.com/95246895264.pdf
    • https://s3.amazonaws.com/zarevizebi/tally_voucher_entry.pdf
    • http://tarafawemuvib.epizy.com/illinois_child_support_direct_deposit_cancellation_form.pdf
    • https://uploads.strikinglycdn.com/files/1514cf1b-4145-40ba-8527-8585ce886099/pewerusujewalimo.pdf
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_f935971f4c2e480e9834dfa35363f5b2.pdf?index=true
    • http://rofosonovoze.rf.gd/10258071319.pdf
    • https://uploads.strikinglycdn.com/files/0a03e13c-4004-4776-9a74-bfa5bb9bc55a/how_to_be_a_good_housewife_50s.pdf
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_a154d85777444efcbd8dc6a5bc8613f2.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f979.bin
66fea74ef78fdea2e9e866291a851ef736401d205bf09aae95d5cdfbe78b4232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 5356 bytes
font_01_sfnt_off00010ba3.bin
abd5c48ae0d70a976f185149d7a4750c440d8e072ac45c412d8173b25e797bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 10232 bytes

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