Malicious PDF — malware analysis report

Static analysis result for SHA-256 269d20b5e1c4acc3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 09:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d455132566729ab348b0ca9c1419db71 SHA-1: 2c8484f231fe3e5edca3bc09ffda1ea4b373809b SHA-256: 269d20b5e1c4acc358986c8a0c0c0c1ca62447c5fd7999fddb5fe6db463316fa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting and a callback phishing lure, suggesting the document's content is designed to trick users into contacting a malicious entity. No scripts were extracted, but the PDF structure and heuristics strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 6

  • 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.
  • 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 http://demirlermetal.com/resimler/files/28452795132.pdf In PDF document text
    • https://evergreencans.com/userfiles/file/89812487471.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/wiretagojixuwusatunaguruj.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/68091455502.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/3658741656.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/wosexojuzagulebinipo.pdfIn PDF document text
    • http://bibikid.ru/upload/55720104533.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/jotozob.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/65068915604.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/kigeweb.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/71945604921.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/kexudusebudizapowotukosej.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/zegepinufaxifebovinu.pdfIn PDF document text
    • http://szcftz.com/upload/korekagiv.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210912_CF0585636CEDE851.pdfIn PDF document text
    • https://redac.ch/upload/55905621498.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/gudijawunuvizulenoxiru.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/27943655298.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vekodakokixobefewapumewu.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tuganikijoruzuki.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/29737225029.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/9102578689.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/69376341986.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/48752544552.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/72420953199.pdfIn PDF document text
    • http://turnyras.lt/Files/file/28520101406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=justice+league+unlimited+stream+freePDF 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_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 10788 bytes
SHA-256: 265539237d5e8b543eb3b007c881e8749b5a21be1de3247275a755697276be4e
font_01_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 18016 bytes
SHA-256: c0dfa7771cbf45cb3de135a6ab49b3f0b6eddf3943d42e34b9cc78624a27aead
font_02_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1