Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1a85ed4b3839b5…

MALICIOUS

PDF

79.9 KB Created: 2021-03-03 06:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 309b51281e0b4c9dff152d3c4ab30736 SHA-1: b27978f776e8f2eed5fad16eacef1321227ce708 SHA-256: aa1a85ed4b3839b5533ab37cda8d745ae9d9e4d3d078098c2678b78e9b520cef
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The presence of a 'utm_term' parameter in one URL suggests a phishing or SEO-based lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=netgear+powerline+1200+ethernet+not+working PDF link annotation
    • https://bivajeliju.weebly.com/uploads/1/3/5/9/135978375/zuwaxuwokale_vubivole_ziwabegipinov.pdfIn PDF document text
    • http://organicsss.space/jerilesols5z7y.pdfIn PDF document text
    • http://usesucre.pro/girl_online_on_tour_read_online_free2q32i.pdfIn PDF document text
    • http://nncucuucuc.space/read_hyperbole_and_a_half_book_online_free8xuzj.pdfIn PDF document text
    • http://ipatovaalena.ru/vudojemuxemetejudewuvili4b6vg.pdfIn PDF document text
    • http://finansi-7.online/therese_raquin_broadway2hfab.pdfIn PDF document text
    • https://bewizujire.weebly.com/uploads/1/3/2/3/132303264/jevikanojadulixerar.pdfIn PDF document text
    • https://ralifanexipoker.weebly.com/uploads/1/3/1/3/131380500/61f15f.pdfIn PDF document text
    • https://peromukagitogim.weebly.com/uploads/1/3/1/3/131383820/rakadojapewo-boxubazi.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/4284906.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/logitech_wireless_gamepad_f710_not_working.pdfIn PDF document text
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/2867865.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/how_to_balance_in_sbi.pdfIn PDF document text
    • http://busurman.space/guide_ne_demek_trkedebj5bv.pdfIn PDF document text
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/dojazedemorasub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bobesesoja.epizy.com/ascom_dect_phone_manual.pdfIn PDF document text
    • http://wumafopid.onlinewebshop.net/how_to_program_my_comcast_remote_to_my_onn_tv.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
font_00_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 5140 bytes
SHA-256: c808df448b6f8b6ee0587a4b5af81df5fb707cceb5cfeb875f863a82c7f6c157
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 11268 bytes
SHA-256: 15ec14a09bc71d292fa2015993e63432273ab49bf596e1bb885452741b1695cd
font_02_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361