Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d92c3e529bead3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 12:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc5b32e55316d77dd8c02aad331a1373 SHA-1: 0072380a6571c06b469060339613d69d011dbb30 SHA-256: c5d92c3e529bead334f86067265cdb64593f00c52cfe17a463ab9c35fd59d254
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, including one pointing to 'allytemp.ru', suggests the document is part of a phishing or malware distribution campaign, likely attempting to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • 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=samsung+s9+stock+rom PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135159a2ebbe---55799097782.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/robenipudilenawedizono.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/laginosedunagotaw.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/tuwepipuvawefigoda.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fowuvinojavamo.pdfIn PDF document text
    • http://princeverma.in/uploads/files/vajedufituzumasawu.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lajaxabosev.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/benami.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/xitovoxirawidadisibera.pdfIn PDF document text
    • http://kag.fr/userfiles/file/puvijiluzunafanamisijozuk.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/61411010732.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jopuwuzafonilug.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zoxabor.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133d09016775---36707516694.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/56605881038.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/79804073565.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/29708424974.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/77273347914.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xizawekuseveku.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/divavajov.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-10/20210910211251483531.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/sipotoxogibabopija.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210908_124508.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kederaxe.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/vogere.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/rivezosutemetodaxorem.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 18396 bytes
SHA-256: ab600e44472d34cf3e99cd0531c5decefb2ba1945ab7382291e4a17795b16b45
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 10736 bytes
SHA-256: d842bcd1147ad9bec6e572c9e288dba863fed6582b75408985ae556f00dc62ae
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1