Malicious PDF — malware analysis report

Static analysis result for SHA-256 1677e40911812b74…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 02:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0e2bd53368a8cda60ca9373a7e7f9ec SHA-1: 820114dcd269722905f6b39508a4bdd7331b3629 SHA-256: 1677e40911812b74d63e1b541867ed9cc306de3c4b4ebba0e1d60b67a236458d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is structured as an image-only lure, typical of phishing attacks designed to trick users into clicking a link. The embedded JavaScript and numerous external URIs suggest an attempt to download and execute a second-stage payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 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.
  • 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://huntic.ru/uplcv?utm_term=klondike+hack+apk+download
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/djhmf6b1m9qbrejrdupca1hopg/76840879848.pdf
    • https://lentes123.com/aym_image/files/nezepi.pdf
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/nijunodinabafa.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/popuzajujutini.pdf
    • https://iphone-odklep.si/vsebina/5119094558.pdf
    • http://kondicionery-noginsk.ru/upload_picture/file/tudipevotukarar.pdf
    • https://kidneystonetreatment.in/userfiles/files/xivebomagaxupiwut.pdf
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/58225409438.pdf
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/32519017723.pdf
    • http://ontis.sk/editor_uploads/system/files/5263101110.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/97232644807.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/98451940033.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5206657c7b71cec5a934511bbdc29aae/47521370020.pdf
    • http://yonseri.org/userfiles/files/66027628758.pdf
    • http://ruihuitax.com/files/file/52878105092.pdf
    • https://movimientofamiliadejesus.com/images/uploaded/file/85740502171.pdf
    • https://kultmotor.hu/images/files/tufemikogilizulozimidiga.pdf
    • https://jeneifogaszat.hu/cikkdata/files/44312317661.pdf
    • http://eternalcycle.com/FCKFiles/file/rabobavekelakubawi.pdf
    • https://mimpishio2.com/contents/files/borixopuzutaruwezeni.pdf
    • http://thevalleytrader.com/files/36591542978.pdf
    • http://hmconcretemixingplant.ru/d/files/naxigu.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/velutoxotus.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/lugijowevuzexevufevafe.pdf
    • https://nwdglobal.com/ckfinder/userfiles/files/wimifanirun.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_off0000b108.bin
d588268de1cb022d1e62620117cf0f7a454add41981e9fd7bf1e1ab9ee90846c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 14644 bytes
font_01_sfnt_off0000d5d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16792 bytes
font_02_sfnt_off0000ede9.bin
eb01c1a9d70717204d8ead4cb7af66dd25950cb67d822e6366a923bfd7324fa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 10412 bytes