Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d692b869188db2…

MALICIOUS

PDF

85.8 KB Created: 2021-04-25 06:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4805ce28d3a2d910f8d561069a0609d SHA-1: ec683bfe9c21f8248040bd5c3e1d742edc7d7e5b SHA-256: 77d692b869188db2e8b337ad54ccf6b576c8c6e7ceb5d62d01cc2fa19c26d985
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=convert+graco+crib+to+toddler+bed+instructions
    • http://kino-vezde.ru/where_are_amazon_videos_stored_on_androidimc9c.pdf
    • http://pokezokebawi.mygamesonline.org/aquatica_orlando_map.pdf
    • http://kefets.xyz/el_aleph_resumen_brevez3y4d.pdf
    • http://ehaberdevlet.com/cyber_hunter_aimbotufkpk.pdf
    • http://3gusevshop.space/ask_siri_zero_divided_by_zero_answerdfqop.pdf
    • http://salizurewaki.mypressonline.com/canciones_de_guitarra_para_principiantes.pdf
    • http://lunatan.medianewsonline.com/what_size_labels_dymo_450.pdf
    • http://lasns.fun/what_is_expository_text_and_example6witb.pdf
    • http://biomaniix.website/156451974785ncfb.pdf
    • http://save50.pro/gunipipibifexobelop0s38l.pdf
    • http://vimobewawulipiz.mypressonline.com/how_to_shut_off_ice_maker_on_frigidaire_gallery.pdf
    • http://torchland.xyz/41998847718h9xu0.pdf
    • http://ig-copyrighthelpcenter.com/82821360995u9bi4.pdf
    • http://duplicwcnj.space/joduxiwafojekodxta1.pdf
    • http://fawaxifiwuzodil.scienceontheweb.net/nimugugovitonix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jazuravazaguz/88421479960.pdf
    • http://nowimirozox.atwebpages.com/lijegi.pdf
    • http://rofuvawitarul.atwebpages.com/sujujibewubutos.pdf
    • http://tudugir.atwebpages.com/funoka.pdf
    • https://s3.amazonaws.com/pilazi/how_much_does_a_scag_v_ride_2_cost.pdf
    • https://s3.amazonaws.com/jivuxo/99009393604.pdf
    • https://s3.amazonaws.com/zizene/is_sanyo_a_good_tv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110a2.bin
d9e199443de1f78286aa809342c5eb00d7838a6f32e4cc1f00c11b165b02ddb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 5212 bytes
font_01_sfnt_off0001226d.bin
8a45c4ebd9fbcba8ee9b53b11168875915de41956d3316a6c697a3081b1fdae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 11520 bytes

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