Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3ecef8dc940b8f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 08:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be4ca991831048547072e74b6ce59ac0 SHA-1: d3adb3cf61126c52e906d3fc7dfae52dbe1c72c6 SHA-256: ca3ecef8dc940b8fe406130268da86ffc51fc704f2201bb2934785ffede5eca5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://preiswerte-unterkunft-papenburg.de/mediapool/volevoferolimabolipod.pdf In PDF document text
    • http://ig-einheitsloks.de/medien/file/fakunimewuwagikeramima.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/rexawofewi.pdfIn PDF document text
    • http://okvin.org/userfiles/file/dasutipesun.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/71717045218.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/87679289237.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/51040519571.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/21969039663.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xuzavurax.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091320121273499.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/mexile.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210920092303628723wwfdr8n6kgnp.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/litidilizakufu.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/8954367064.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vefubugudaliwuz.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/86beac750d526de2e7db4f6ee54af2b1/fature.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/lenuwajagabizuwi.pdfIn PDF document text
    • http://thuannam.com/image/files/vuvedisufun.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xovomo.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/90461954942.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/mizajer.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/6187996046.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/81938937367.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/50047074705.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/89695534765.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/77943192209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a1+netzwerk+kursbuch+pdfPDF link annotation
    • 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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 19532 bytes
SHA-256: 4fdcf3e1ff62df354fd5ff98efd126995ad9555a895c78d6a16855ca7d5ccd85
font_01_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 10808 bytes
SHA-256: aa3cade32ec55f4129199577eff38c33615fa3873a578e15c7ea35e2fc73e754
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1