Malicious PDF — malware analysis report

Static analysis result for SHA-256 c255fed3ef85146e…

MALICIOUS

PDF

75.4 KB Created: 2021-02-15 04:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cda3d5626515849ff8e90bf78d63b15f SHA-1: fcf05dfd07406d39a07d2bc2c02a0d1bfa1f9c51 SHA-256: c255fed3ef85146ec627c2c4c7116f8a0e1c30117e6f6c4c5e18c9131584504c
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness. The document contains numerous embedded URLs pointing to external, potentially malicious sites, suggesting a phishing or credential harvesting attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/wix?keyword=radical+acceptance+pdf PDF link annotation
    • http://finansi-7.online/dining_room_sets_cheap_free_shippingw8ra2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fc86e8abdb78.pdfIn PDF document text
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/lajukuna.pdfIn PDF document text
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/5178de616.pdfIn PDF document text
    • http://bankrot-biznes.ru/aadakilerden_hangisi_hizmetlerin1sced.pdfIn PDF document text
    • https://cdn.sqhk.co/sumefixes/e9Vyhgx/76214112895.pdfIn PDF document text
    • http://meetraisins.club/cheat_engine_apk_rootsuz10r7v.pdfIn PDF document text
    • https://cdn.sqhk.co/bipujawojeli/ogeighj/simcity_buildit_layout_2019.pdfIn PDF document text
    • http://uaregroup.com/414105441620u4fx.pdfIn PDF document text
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/wugixiru_wosubi_makazubop.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/xevinobexali_lefupid_roxavaluret_bamonamuwakunab.pdfIn PDF document text
    • http://nout-sale.site/34644551443z3klv.pdfIn PDF document text
    • http://teachersaid.fun/tivugaxifusiwigixe4pibg.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/jashhif/league_of_legends_wild_rift_beta_update.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427293/normal_5fcf933fe408e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_60119eb7e2f60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_602336de84672.pdfIn PDF document text
    • http://natikolom.site/ibiza_radio_house_music_party_2019_best3ilzk.pdfIn PDF document text
    • http://natbeach.space/adb_drivers_for_android_phone4fs4h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff045db011ef.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/igiidhj/18847081320.pdfIn PDF document text
    • http://iblack.space/foxugarodeujf5.pdfIn PDF document text
    • http://ita-fitness.fun/wofaf4gfrt.pdfIn PDF document text
    • http://idealica-official-it.website/zepujuzuqqv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 4884 bytes
SHA-256: 423e0560cb255f231095abc2f9b6b03b484f17d891a34c7b9ee7bf01c9fe310d
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10492 bytes
SHA-256: bfb2b60b80d7ec80d1a400d803fd6202c3326a6fb808f30968e533012937542f

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