Malicious PDF — malware analysis report

Static analysis result for SHA-256 c172a1ace175eb44…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 23:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11e65502b1d315e6c9ee4c664f2a1467 SHA-1: c4e6228f412a3b95963a5a4881d6dfcd01764108 SHA-256: c172a1ace175eb44770ce9e511f1bd08e82b9d0bc3a9f9e3d782e3c70cab049d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document also employs a 'download button' lure and a 'password archive' pretext, common tactics to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=minecraft+full+apk+indir+gezginler
    • https://e-tta.com/app/webroot/userfiles/files/50559278778.pdf
    • http://sipzip.com/userfiles/file/83046312897.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/67386239568.pdf
    • http://edu-soft.ru/site/htmlimages/file/xurasa.pdf
    • https://olgunbey.com/upload/ckfinder/files/65740157111.pdf
    • http://megalabsrl.it/userfiles/files/mowolimitesi.pdf
    • http://www.elstar.ru/uploads/files/lales.pdf
    • https://pnvvr.ro/userfiles/file/lavilatajesoneruturom.pdf
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/naxubesufi.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/52771687298.pdf
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/xurenugi.pdf
    • https://motecx.com/images/file/jumibanesevekib.pdf
    • http://www.gulbaharsigorta.com/contentData/file/morixagabobezarole.pdf
    • https://sadhankendra.org/erc/media/xodunubu.pdf
    • http://zetrade.cz/userfiles/file/14070960045.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/pusaxagefufanudagofonuwod.pdf
    • http://mlight.cz/archiv/file/tapunovamopagirun.pdf
    • http://saddabro.com/userfiles/file/67593728529.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/2b34cb67e2c2059b6daf6f107a98a6db/90601504479.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/wawomotugadovibidivazojar.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wapetonugiruw.pdf
    • https://paklya.su/design/img/upload/file/52370996434.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/13b84a076a416df001b763b656f40a52/xejukazogudalajigumi.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/xakerejuxotojotidoramub.pdf
    • http://akbarestate.com/survey/userfiles/files/2030037623.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ee.bin
a92ff920bf350bd542519c703d49b36b2d666251b69795b3c7914a24dc92289c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 10752 bytes
font_01_sfnt_off0000ed97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 16792 bytes
font_02_sfnt_off000105a9.bin
5baeb265239645d94079afd2d76a1f162ca21b67c9d2ef6aa74e8c57b35d4c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 21060 bytes

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