Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a1fed574945bea…

MALICIOUS

PDF

90.3 KB Created: 2021-09-18 12:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e506b22d32232896677b14a5fdb4423 SHA-1: 4447f64c8df1e7765ad1bb1ae58c02556383efef SHA-256: 51a1fed574945beac746d0c420f7213654c33b3f00196a3f4f879213486518a9
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated, but the presence of many distinct, low-reputation URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://autosoftware.company/autoresponders_images/files/zimigugetobolor.pdf In PDF document text
    • http://rovitek.com/userfiles/file/18072549297.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dfef2a49---nadovofiwowomiru.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210914/file/1631586454.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/vugoziduvixogo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/65163385245.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/47523163498.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/93709316549.pdfIn PDF document text
    • http://jinyezi.cn/upload/40273916593.pdfIn PDF document text
    • http://fivelscope.net/fckimages/93569659689.pdfIn PDF document text
    • http://runo34.ru/attachments/file/pifawumekuk.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/detujezividojegaxidajoro.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/145370396613e5e974cdfd.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/9175412105.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/zutamejukasasure.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/64319828096.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/57691999118.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kununapelosamudotorelori.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/lesisuduki.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/vinivoz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613510da09d04---57313902169.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/89828646308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=life+the+science+of+biology+sadava+pdfPDF 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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 11076 bytes
SHA-256: b3674ac6e84597f832eadf68a0caa48592e33fb98405eb45e59fe33c36af651e
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 19100 bytes
SHA-256: a233f33584a6ba0966e1d525de574fa0d022cffc39da712c4af9bf502ed512c6

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