Malicious PDF — malware analysis report

Static analysis result for SHA-256 289f8fb996758001…

MALICIOUS

PDF

74.5 KB Created: 2021-03-03 21:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 01687261cc486315d8326ca504db7cfe SHA-1: ab89426af475f00c827851ea267c568238ed5d8f SHA-256: 289f8fb996758001385a94dec328faba973f68c4149b6dff8f0cfb1e22be14b3
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of external URIs, including a link farm on disposable hosting, and a 'download button' heuristic suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious sites or trigger downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gimoguvi.ru/strik?utm_term=how+to+download+mp3+to+iphone+from+google+drive PDF link annotation
    • http://pshcomonhere.xyz/jusolizijupusigisogotavkdmw.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/vimumimopesiba.pdfIn PDF document text
    • http://guitar.su/32112529582vzb8t.pdfIn PDF document text
    • http://teachost.com/mupirocina_isdin_20_mg_g_pomada3egkd.pdfIn PDF document text
    • http://pevokepavaxe.iblogger.org/fojebuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_5fd86fd8316d3.pdfIn PDF document text
    • http://raftgjgr.space/562524033o7rkp.pdfIn PDF document text
    • http://jejepofat.22web.org/spooky_scary_skeletons_sheet_music_viola.pdfIn PDF document text
    • http://mrt-pozvonochnika.moscow/how_to_weld_1018_steelw21l0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_601470c2361ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/kenmore_coldspot_water_filter_housing_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/75694045611.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/taco_bell_grilled_cheese_burrito_recipe.pdfIn PDF document text
    • http://noratev.myartsonline.com/zapevupelanivulagu.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/45691515053.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/cardboard_sheets_1200_x_2400.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/cima_case_study_report_format.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/matthew_hussey_retreat_2020_cost.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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5556 bytes
SHA-256: f057f7688006b54fcbb3b8babf21458e7971f585676b116eb744e2fdf3eb10ab
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 10528 bytes
SHA-256: e5f9917c0fec2dbc6fc489d030bd01b3fc5de535f1dc921a8804dc18f0cd6ab4

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