Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a9db514e58676e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 13:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b57c94bc97e5bac3f6496ae7a49053c SHA-1: 87b29a07a85b45e1e7eddf8b33b71d68c4d55ed4 SHA-256: 28a9db514e58676ed30437b0086916e13bafa8b4561e731aca49f9584516c003
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=compaq+presario+cq57+bluetooth+drivers+for+windows+10 PDF link annotation
    • http://jatudoz.getenjoyment.net/vexazetoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_602ca1e9eeefb.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/id8ihib/xadinevuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_5fdb30276be04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448339/normal_6001e27218727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5fcf88fe9bb48.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/john_deere_x320_hood_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/BJKhhv1/kim_kardashian_hollywood_game_hack_iphone.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/zitofoviduzejosapo.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/icFhggi/hashtags_for_instagram_facebook_twitter_linkedin_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/zebusukef/MhaQNib/snapper_fish_translation_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/ggyjphd/26930118408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fcfa08a52a43.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/bf3e8311-e0fe-4fa2-8d84-d1cf96b20807/39341428619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0b15f5-1c50-45ad-bc64-17e5f5f3f50a/mulakim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef86062-ce56-4b31-a4ac-2420912a735d/taserobumigigirarufamak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a839398a-f868-462a-9dbe-8126ab2e0c44/sebenigu.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_6f107e5847064a5e80f72ed148f7fb96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa020f70-cb9c-4bbc-9afd-55f0a20856bc/lord_of_the_rings_animated_movie_free.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_ade86dde056d4804baa4f47fb1d0345f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a88eb88-4556-4afd-b416-c3aa227541e6/punctuation_worksheet_for_grade_5.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_09e4ba590d89437d9d2288f0e44b22fa.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_8d8ab1bbfff641f1885542aa3857d089.pdf?index=trueIn PDF document text
    • http://todifisafi.atwebpages.com/research_topics_in_educational_management_and_administration.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_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 6116 bytes
SHA-256: 5bbb51d8cd0179b5198e49e8a90c75aed079dfc253c731c8e68c90285f9691ef
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10868 bytes
SHA-256: 3389940e21f525801d1a79ce90eb57078ddb5e16be92e2d3e21b065c1db73b15