Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f16b1799309110…

MALICIOUS

PDF

68.5 KB Created: 2021-09-17 13:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcf13bb384a43e8f31a3260dff87b259 SHA-1: 9afb027307f60600b202dc0027b2948e988edf07 SHA-256: b1f16b17993091108629e36cd254e0cf682d4f3b687380a36270c9094d16479a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and a clickable link to an algorithmically generated URL on a disposable domain. ClamAV and ML classifiers also flagged it as malicious. The presence of multiple external links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://ambulatorioveterinariocigliano.com/userfiles/files/62799114617.pdf In PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210912_1567FCC34BCCCAEB.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/18653997338.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/84723145549.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/54878615253.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/gemiwelotuga.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lidesisoridonapipunod.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8e9f65d6b4c630c12d81270f77102d5c/22523691500.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/tanedobegofelit.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fatufuvepuparujam.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/95632519096.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/dagika.pdfIn PDF document text
    • http://packamate.com/userfiles/wunuvuxi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/67194198370.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/sumexefuxi.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/rovujobasexejavi.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/sidazogesedilatubodexopuv.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/zokowapune.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/37810458384.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091101384973499.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/94944252467.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de06ade3f9---63778594170.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/15802535265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+vice+city+for+android+free+download+apk+data+highly+compressedPDF 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_off0000ae14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE14 14060 bytes
SHA-256: 54e47facd633e81bf96b996aa2c3386cfeee4841b919fc7cad62d3752d85408e
font_01_sfnt_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 11464 bytes
SHA-256: fea95cefa412d311827ce5f972c1d67dd3cc5aaeea228642f7f92ef6ac023b99