Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e9667b7af11528…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 00:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de905622c3b4691a630aea961c9bc291 SHA-1: fa0ea7b2ad7a7520f11c1effe9dd44d57c76fd0f SHA-256: c9e9667b7af115281aa80ea9beaf6635efa69a107e88144274a771d7a15dbb73
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 67 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 https://cructi.ru/uplcv?utm_term=free+ios+emojis+for+android PDF link annotation
    • http://kemenyseprosiklos.hu/upload/file/jasegesovalix.pdfIn PDF document text
    • https://petribax.com/userfiles/file/49580895425.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/milakosip.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/wizixekafuwa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c933528f7e---99903937294.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/57780209934.pdfIn PDF document text
    • https://j26clean.com/upload/files/bevij.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/14944050083.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/guxorudaxugivukowinil.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/liposovedorilogelonir.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/82117311457.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16704013---66775933965.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/rujirato.pdfIn PDF document text
    • https://intersat.lv/files/file/24872836793.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tivuvodesebusifono.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/letemozadapufejariseze.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/111113638.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tewidoxabomis.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/supopipamobovul.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/siranitijil.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/bidezulenapim.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/91418518925.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/16580792145.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/38630106585.pdfIn PDF document text
    • https://alutat.com/data/file/xazobawivo.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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 10480 bytes
SHA-256: bd701c644aade689ef6c7666608221a76bf0e36fa91bb5f9493317cec7425711
font_01_sfnt_off0000c71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 14216 bytes
SHA-256: b9bd8119a1513e22a3e6e75e34cb5f2a394abf5b629a7ac2ddd155222c2faac8

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