Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7d5ec855cf2450…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 15:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ee391a5609d814398961d5e0e7216524 SHA-1: 222a6255a1d445fe3703fbcbb0069671c9c828d3 SHA-256: 4c7d5ec855cf245006481ea1eb010e9fcface46b2a99ed579b01df28c6f8a4de
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to potentially download further payloads or redirect the user. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number for a fabricated issue. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://safarekhoob.ir/basefile/safarekhoobir/files/22126010904.pdf In PDF document text
    • http://myshiou.com/uploads/files/202109040106349186.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wutefeda.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/16645718125.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jeripitepabanapexebigix.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/61102327996.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/22948592904.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/35550885683.pdfIn PDF document text
    • http://briztravel.com/upload/files/59093741271.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zapamegixumimerefunosa.pdfIn PDF document text
    • https://dellrein.ru/content/file/tulisevulizufe.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/84292862265.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/88278818860.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/gonudisipilo.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/texikasuwufepeze.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/39132062167.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109111247348377.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/50330558807.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/16576485017.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/80405179889.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/lufazowuwoxifo.pdfIn PDF document text
    • http://gespk.com/userfiles/file/50976678522.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/daruwirabagisabobupepilet.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/sebolebu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/nukoxezametedazobed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=facebook+chat+heads+iphonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 10676 bytes
SHA-256: 29d66a2220dc4bf443ff7113338d76a5af125cf9667666a8a12ecb6a9b1d8f29
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 18156 bytes
SHA-256: e961a3049a53103f2e4197e210789edc0bbe3b5fda65d79cc5d2af9f7807dae5
font_02_sfnt_off00012c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1