Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d723b9044cae67…

MALICIOUS

PDF

75.4 KB Created: 2021-03-04 11:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1133068cf502166e56793cf1ddac8faa SHA-1: da103f6409d2d827256a92d2d97a1af7134701a7 SHA-256: f1d723b9044cae67beecac5f95c978927bbcfe1a11d58438e94daeca1ca7d1db
146 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting and a callback phishing lure. The document body, though heavily obfuscated, contains references to preparation for a physics exam, likely a pretext for the callback scam. No scripts were extracted, but the presence of external URIs suggests potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botokaw.ru/award?keyword=how+to+prepare+for+physics+exam+class+11 PDF link annotation
    • http://zakosemej.mypressonline.com/diwipejudogebe.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/dtiehd1/old_school_board_games_for_sale.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/difference_between_leader_and_manager_example_ppt.pdfIn PDF document text
    • http://letgtma.bid/bitovobawovidukidosaqibgb.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/BNgjiMF/learn_speaking_spanish_free_online_with_audio.pdfIn PDF document text
    • http://bupro.asia/35077016014x0tsl.pdfIn PDF document text
    • http://omynutural.space/gagubisusudofupalibuwote4j0aw.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/d8ihjhT/fejitalakuwimotivukeb.pdfIn PDF document text
    • http://greatholl.com/toro_personal_pace_lawn_mower_battery_charger3hy52.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/bGjehhq/classic_telephone_ringtone_free_download.pdfIn PDF document text
    • http://puxuwowu.iblogger.org/dosusuwaxaxe.pdfIn PDF document text
    • http://nugiperemepan.22web.org/98732148956.pdfIn PDF document text
    • https://cdn.sqhk.co/tizesefetus/Pzijhz4/nirufijipi.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/meripiravajumol.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/bciahht/the_best_party_hits_of_all_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firuxafuxu.rf.gd/13600514566.pdfIn PDF document text
    • http://doxewadafexe.rf.gd/following_directions_worksheet_for_elementary_students.pdfIn PDF document text
    • http://vajowevub.epizy.com/kumenasaf.pdfIn PDF document text
    • http://difesasud.epizy.com/waxixovaserij.pdfIn PDF document text
    • http://dozonixenot.epizy.com/66745472133.pdfIn PDF document text
    • http://tenimogutoteme.epizy.com/24115113582.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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 5528 bytes
SHA-256: d3c18a08fc846ac7a6d8edd1182787195950af88ef33ebc99e1320a0c64b8ab4
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 10892 bytes
SHA-256: e8ece8df30c8c8589da176b767491abc83fd5566233f5fdcf0e075ff8ac72c08

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