Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef23855ea2d519f7…

MALICIOUS

PDF

77.0 KB Created: 2021-02-11 22:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 564ccce08c28fd9bde155a4f2bb9b352 SHA-1: 14c9dab4d5c8c07e3bcee3a358b5dde1aae261f7 SHA-256: ef23855ea2d519f7f243812f1a905a9325b74bfd8820fbfdb1b062de522ff351
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://jottigo.ru/wix?keyword=halo+2+exe', is likely a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://jottigo.ru/wix?keyword=halo+2+exe PDF link annotation
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/283780.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/mopuvefinusawebox.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/gdq1Kjg/shudder_movies_best.pdfIn PDF document text
    • http://wide-do.top/dijifepadavobepi3hg0h.pdfIn PDF document text
    • http://appletopshop.ru/toefl_writing_samples_agree_or_disagreevl3ma.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/5hjric4/86610863089.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/1QgXihq/83178382832.pdfIn PDF document text
    • http://organic100.fun/bajrang_dal_song_dj_shashiz2zxp.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/hieigjc/handwritten_notes_apple_pencil.pdfIn PDF document text
    • https://jorikumovitakus.weebly.com/uploads/1/3/4/8/134883246/3727954.pdfIn PDF document text
    • http://max-lifting.store/cambridge_checkpoint_maths_textbook_2aegke.pdfIn PDF document text
    • http://milesnires.xyz/1880747649901u60.pdfIn PDF document text
    • http://xizabif.22web.org/interview_skills_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/SFjiyIr/gexerude.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/college_placement_test_questions_and_answersr98ny.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/Qpgcghx/philadelphia_flyers_scoreboard.pdfIn PDF document text
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/wulububaxafat-zejaxuf-sabinesap-nifeligunuzate.pdfIn PDF document text
    • http://maewallace.com/33963669525fxch0.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/gIijjeq/robotics_engineering_salary_in_us_per_month.pdfIn PDF document text
    • http://repaircreditscore.info/42770350256050si.pdfIn PDF document text
    • http://debugor.iblogger.org/fizafafulekobifugisux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 4568 bytes
SHA-256: 1c3f13687fb4b39641214e129690c9711b51206b05ab5c46ff800ce0390472af
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 10472 bytes
SHA-256: 8d92f23b1af7b75d7cbcd783a0c896b728b149a7573c6502a7880a388a1dbb20

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