Malicious PDF — malware analysis report

Static analysis result for SHA-256 950bf24c8de999fd…

MALICIOUS

PDF

76.1 KB Created: 2021-06-06 14:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f13c1f38a7bca4cb24e81cfd3108aaf SHA-1: 25307f1a59b87214c119e2b6323c1b77552bfc1b SHA-256: 950bf24c8de999fd895186016ca79ab4c3c6b8bf4acfaf8769d1db662d9dfc35
134 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with one prominent URL suggesting a lure for downloading content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=mental+ability+questions+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423757/normal_605bdde290c4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ff1e6a56e5f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_60449366db636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_601921825bb9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_60320e28576be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fd1e99dca7db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5fe36ed9ea301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barumena.pbworks.com/f/38081866350.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/w/file/fetch/144526728/netflix_for_android_tv_box_6.0.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7e75a9-1d04-4b20-9b83-4729ae457a81/tepazikivuwavigewusaz.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/the_great_gatsby_doctor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d92c021-b061-456c-975e-6dd9c75c8962/rogukerijezepip.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/77806212844.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144544410/skin_changer_fortnite_download_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b618c79d-7a74-4654-b808-16f28631296a/what_kind_of_milkshakes_are_at_sonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1d78dc-167f-48fd-ae91-90e712c3f63c/dudekoxufurupata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a13a518-41f9-43f6-b237-9f5c5fbf3108/how_to_manual_mtb_29er.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144443478/rilewuwomibuwofizowegepas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c15bd3a-c2fd-4955-b219-d611d702e288/pisifirobi.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144718089/artiste_street_art_connu_anglais.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/jawojumadorudabozowix.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5404 bytes
SHA-256: d695184565f4426da2e0dac1e341435e1576f926dc24a16b8c6b17cd231af0bb
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 12096 bytes
SHA-256: e689b3013f1a6a31d8bdc442ab2f4663c59e418123703a0afc79e1d6736f53a9

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