Malicious PDF — malware analysis report

Static analysis result for SHA-256 40db82f0ecd7db90…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 22:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a70888b744d1eb4a301ba38c0d8e2a12 SHA-1: 3b63f88ca4b2e26c39b4b5c949e507dcb27c0ec3 SHA-256: 40db82f0ecd7db9005feb8621a825338f5408aa0e8ad8a48156374d7e40cfe41
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, being image-only with a clickable action trigger and a small file size. It contains numerous external URIs, including one pointing to a potential APK download, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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
  • 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 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.
  • 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=fs+18+mod+apk+download+for+android PDF link annotation
    • https://siltri.com/fck_upload/file/gutonumizaxema.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///46421453026.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/38486213749.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/bobosojavajipefigedowepal.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/91606113130.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/jisixamoguketovo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2d66d4cf26665b914a288daf7f11af5e/17570152117.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/46300489853.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210909135347.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/rejefe.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/24141286410.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/makagowufirakapo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wuvizavakewuvo.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/60701101989.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/21208882276.pdfIn PDF document text
    • https://nasikampung.info/contents/files/98798137394.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/vipibifozupulu.pdfIn PDF document text
    • http://edeins.com/userfiles/file/465203866.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pelovotuduxadib.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/39667610320.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/20744598033.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/5679471122.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/girixogugedawigeme.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_off0000acdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F1 14548 bytes
SHA-256: 55f38a40a1f979ec08d86ac99a51990d02248e1c09840bb40c3e0d44a3d792eb
font_02_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 10844 bytes
SHA-256: 7f2765a9b51f0a3cccb0947b6687c52857221360c56caa6d697657f5db88a394

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