Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faa5dddcac60bce…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 00:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af51239ebddd6542e61ea629f18aa2ce SHA-1: a669a4b67a09a5f108f10e4e4378513a8fa818c0 SHA-256: 4faa5dddcac60bce8a3ba05c080326daeb57dd2947be7eca270af7586c7df314
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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 https://lotte-ppta.com/beta/assets/file/figuv.pdf In PDF document text
    • https://mosallaesf.ir/uploads/ck/files/23163592315.pdfIn PDF document text
    • http://rideco.hu/upload/file/79064236648.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/lexupuzutuku.pdfIn PDF document text
    • http://symbolfoods.com/files/file///72850728037.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/4699035411.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/livabib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0378b871---10571632464.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/fowixuworakemujit.pdfIn PDF document text
    • https://tele-video.ru/upload/files/58216110539.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/96858891361.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/19990291724.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kedejorunirokemovino.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/37290559528.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/wilogojowetadonanajagi.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/91707326994.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sobirosuxusujuxixewaduj.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/vupufaruvewaniwukulewalip.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/94263724002.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/33894287659.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/rofuvetafopewa.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mutevativ.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/fikojetixufujotepol.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/4048457548.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/mifabagositowifuvogudux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=default+phone+app+for+androidPDF 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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 17620 bytes
SHA-256: 83783f659be53963cb3ca09f9416dfbbeff9c330c33db7056d0789128b384a33
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 10528 bytes
SHA-256: a99cf5533b6c39f33ce014063300f37a047e0dbf7893ab8e129ebeaec44d09a2

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