Malicious PDF — malware analysis report

Static analysis result for SHA-256 811dce58a2a546ee…

MALICIOUS

PDF

67.5 KB Created: 2021-03-29 07:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d5f3b06ebbffcca5295342bebb8b703 SHA-1: afb58d9c34b94ca806e67a97dcf9805b0ab352fa SHA-256: 811dce58a2a546eed5673fa179733895f976ceacb561667c41390c89996cba4c
134 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/aws?utm_term=math+textbook+for+grade+3+pdf
    • http://rivezetufizi.iblogger.org/vudutawepadezekupa.pdf
    • https://bididanigatozum.weebly.com/uploads/1/3/4/3/134314142/timopifasokel.pdf
    • http://penaxuwilamufo.iblogger.org/how_to_upgrade_astro_a50_firmware.pdf
    • http://vefuxeromuriwir.iblogger.org/40898863586.pdf
    • https://cdn.sqhk.co/jorafulati/0Fyjfhg/bivozuz.pdf
    • https://cdn.sqhk.co/muribirigim/zhdhgji/lewaweboxejada.pdf
    • https://cdn.sqhk.co/tuwetebep/wjapHzl/1882030324.pdf
    • http://fojosug.iblogger.org/tshivenda_english_dictionary.pdf
    • http://pefipegukanijel.22web.org/balance_sheet_free_sample.pdf
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/tokezuxosi.pdf
    • https://cdn.sqhk.co/jadidawa/hMgJDp9/mobile_gamepad_for_android_tv.pdf
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/davavezup_futen_dimuxakumo.pdf
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/mavaxorabiwegedura.pdf
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/sapolopegesasejo.pdf
    • http://zesawazebafipe.iblogger.org/search_engine_optimization_book.pdf
    • http://xibevajisigidig.22web.org/gexozofesiloxavaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fesumoxidixup.rf.gd/bepifibuvujeriwil.pdf
    • http://kalapifupedafog.epizy.com/nakematasijipopubut.pdf
    • https://uploads.strikinglycdn.com/files/c03fc26a-4410-4c21-ab4c-459350fcda7c/tuletak.pdf
    • https://uploads.strikinglycdn.com/files/c5b2aa13-ad84-47ca-a222-396f899ba643/fifty_shades_darker_soundtrack_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/79c23a1b-0094-4b19-bc83-cb8a0928dff8/32588133578.pdf
    • http://laguzovola.rf.gd/36252361381.pdf
    • http://vorawaforase.epizy.com/auto_detailing_service_menu_template.pdf
    • http://foxoxamaxanibi.epizy.com/96887771984.pdf
    • https://uploads.strikinglycdn.com/files/c0697a3b-9a95-4937-b966-4f1e1c15d24f/jezadovukaredujew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9bf.bin
147d9b1b546125267246784acfdaf8dab180fb8823085b81a0a16cbfb0263c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 5532 bytes
font_01_sfnt_off0000dc9e.bin
7fb1ec348db6c4b3775b7b99740a15902df6874b018115a032f48a5a46afaf84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 10052 bytes

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