Malicious PDF — malware analysis report

Static analysis result for SHA-256 1133696ce79785ab…

MALICIOUS

PDF

67.4 KB Created: 2021-09-29 05:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9376a2327156bc88714d79d6a99e21a7 SHA-1: 0690e139eb6cf756347a75055e66563ee0e33c3c SHA-256: 1133696ce79785ab5721d12577afab8a3a482168a2e9bcc708b4968faf17a9cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to redirect the user to one of the listed external URLs for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+connect+mobile+data+to+tablet PDF link annotation
    • http://zamel2.pl/userfiles/file/56689401188.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/zumonitivelabog.pdfIn PDF document text
    • http://ellev.fr/upload/files/73146768088.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/lopijusedavolojupibojavuj.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/23636568665.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/33313389380.pdfIn PDF document text
    • http://xtra360.net/campannas/file/tedasovevufiviluza.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/74930915731.pdfIn PDF document text
    • http://sro52.ru/uploads/files/67795354679.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/5720244965.pdfIn PDF document text
    • http://synphabase.ch/upload/file/rifofajuj.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/70672385455.pdfIn PDF document text
    • https://tonitomov.com/picture/file/8068110626.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/1888685067.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/62744888238.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/30722434603.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/garupes.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/75224912846.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jepulumulofileronowo.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/munogarul.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/baravodufijujisamotu.pdfIn PDF document text
    • http://taborgospelassembly.com/userfiles/file/8468005605.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109051416009993.pdfIn PDF document text
    • 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_off0000abed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABED 10480 bytes
SHA-256: ac599983dda01720529f3288e3edcf8e6abc7be4f9ac4a4cf457bd7793582f14
font_01_sfnt_off0000c3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 14744 bytes
SHA-256: 778b3c542c320fd6dfb4a673537cc75843a50d7b954853f7dbcbbf8407db5d4a

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