Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8952bf338fecf4…

MALICIOUS

PDF

95.7 KB Created: 2021-03-22 18:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d1889543496edcdc16acef30741a3743 SHA-1: 4870eb8f32d27e0b9c0d3b55564c15cac877eafb SHA-256: 7f8952bf338fecf4a12c3a7a8c0cc2b27ca637c41743e78ab47c26a9c0fad605
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The file is a PDF containing a large number of external links, many of which are to PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://ponafet.ru/wix?keyword=u-haul+university+test+answers PDF link annotation
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/wepadepomozozif.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/vikebo.pdfIn PDF document text
    • http://prodson.space/integrated_physics_and_chemistry_textbook_mcgraw_hilluwbn4.pdfIn PDF document text
    • https://bipawekiramobaz.weebly.com/uploads/1/3/5/3/135325031/0b65d.pdfIn PDF document text
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/9169675.pdfIn PDF document text
    • http://bobimesufapi.iblogger.org/80693810412.pdfIn PDF document text
    • http://alteramaks.world/motorola_scanner_mc9190_rebootulvp7.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/fantastic_mr_fox_full_movie_in_hindi_free_download.pdfIn PDF document text
    • https://rodadeta.weebly.com/uploads/1/3/5/3/135391988/167590.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/71050831599.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/hp_deskjet_3052a_not_printing_black.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/weather_report_of_jessore_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/rogozavibotexib.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/91741806859.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/how_to_replace_drum_unit_on_brother_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/is_army_drill_sergeant_school_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/mass_effect_andromeda_achievement_guide_and_roadmap.pdfIn PDF document text
    • http://joxegav.rf.gd/28800957073.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/history_of_modern_art_7th_edition_download.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_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 5048 bytes
SHA-256: 222054b6688fa2b8af6f504b4d4f595bc14088e8cafbc1a8ba5fd055cd5b3785
font_01_sfnt_off0001466c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466C 12852 bytes
SHA-256: 33b8dcf96d7390e71bdbe305bc77999bce5f5884fc9e1b9bbf1ba5793410d1e1

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