Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e47d8847ac7873…

MALICIOUS

PDF

75.3 KB Created: 2021-03-09 14:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6483c3beaf6c9b67dee2c7f6bf27d6ca SHA-1: dd6359276c8e15538f4228c8b3f223ada56b4e64 SHA-256: 84e47d8847ac787326d899e7c84ff864cc64542b2073d6d5951339fba90edf5b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=division+worksheets+5th+grade+word+problems PDF link annotation
    • https://cdn.sqhk.co/tamoravuwera/aiiPjkw/27446828594.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/3alhfib/xibukomajo.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/44771294117.pdfIn PDF document text
    • http://freefire-gifts.com/21762984491ygsnj.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/vulidu.pdfIn PDF document text
    • http://pasendapp.online/36299318301mzg55.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/hjdFgje/vacation_bingo_play_the_best_bingo_game_ever.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/diYggif/buxegapuruz.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/pudogek.pdfIn PDF document text
    • http://clubstore.pro/back_scratch_test_strengthndjeg.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/ibaR4q9/14634548719.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/hiigfmK/gifibeniwojasi.pdfIn PDF document text
    • https://cdn.sqhk.co/rijolumexeb/jeQ4ifL/18363350202.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/buvametakon.pdfIn PDF document text
    • http://goodsun.space/dark_souls_3_hardest_bosses_including_dlceasmd.pdfIn PDF document text
    • http://handler-autoscout24.com/ditegilonusazejaduputaram5j1ul.pdfIn PDF document text
    • http://sks-expertiza.ru/dezemazimegenavimedbabd.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/dinefonudoloridemivabanik.pdfIn PDF document text
    • http://remontlegko.info/daluxekaxomo3b7g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/behringer_xenyx_x1204usb_driver_windows_10.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/jadutifazolilavafa.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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 5852 bytes
SHA-256: 226066af2b3c3bb1d357556e8da65030e34c23955c46a7a6d4829742a513b1db
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 10148 bytes
SHA-256: 0ea48aad480a13556b2fb530b07ee17e04b5593c1210099e2b5acf8fc143fa29

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