Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89ca4b46847cf3d…

MALICIOUS

PDF

126.8 KB Created: 2021-03-16 12:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3bfd45836aa8bf9c3e1bbf1159201fec SHA-1: d7333ce3de43d062e2a192ad559de60465d90b68 SHA-256: f89ca4b46847cf3d095f5ddde60e451dea84256ccc0d0cc77bfe66c8c4336955
66 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs, many of which point to disposable hosting. The ML classifier strongly flagged this PDF as malicious, and the presence of a URL on a suspicious domain (`resalured.ru`) suggests an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=what+does+filial+piety+in+confucianism+means PDF link annotation
    • http://jufukumodubaxuv.iblogger.org/83054729718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_5ff166f6c967c.pdfIn PDF document text
    • http://folivapizi.66ghz.com/dafuxedexaw.pdfIn PDF document text
    • http://lefuduzitenazig.22web.org/32631071308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_605077d554b74.pdfIn PDF document text
    • http://widesez.iblogger.org/62040497851.pdfIn PDF document text
    • http://bevejisenew.22web.org/alp_psychological_test_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_600ef8047bc75.pdfIn PDF document text
    • http://ximonibu.22web.org/atoms_and_molecules_class_9_notes_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_604735a445892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_6021a967f0054.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/622b1f64-fcad-4de4-906b-d0825ea85716/defiant_motion_sensor_light_home_depot.pdfIn PDF document text
    • http://vazizifur.epizy.com/boost_your_vocabulary_1.pdfIn PDF document text
    • http://lebidaxelu.epizy.com/responsive_media_queries_css_template.pdfIn PDF document text
    • http://tevufojetuxovud.rf.gd/spice_and_wolf_manga_last_chapter.pdfIn PDF document text
    • http://misamoxatupepos.rf.gd/57325144841.pdfIn PDF document text
    • http://fozajekipijijax.epizy.com/14430746500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8b7f37-9a3a-454b-b8b3-de2e5dca466b/wakow.pdfIn PDF document text
    • http://bigibejunewolov.rf.gd/how_to_force_split_screen_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030627cb-374b-4719-b789-c71e7d4e5d4c/11728069499.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16287 25656 bytes
SHA-256: e6d18a3a15dda316253e8b031d688075e31308ddcac4bd4779b8f4b96871a459
font_01_sfnt_off0001b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B21E 5416 bytes
SHA-256: 758218af8e8325173ad1f81f56802f54940163e55494e62b8c6a812c9567b5a1
font_02_sfnt_off0001c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C480 13024 bytes
SHA-256: f1a4b61bfcf18c89d011679af4d1b728781cce5350ead41e98898cff074bf81e

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