Malicious PDF — malware analysis report

Static analysis result for SHA-256 852566c1701b35f3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 19:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4107fb4d7aa73f8ecb1bbe67d2750a20 SHA-1: b1c738213ebbaae065e3f283067d6568413d2bb2 SHA-256: 852566c1701b35f35a75cc5b395516c306c8f7762d2bf4dbd9862c913d72f545
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to disposable domains, suggesting a link farm designed to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and the presence of numerous links indicate an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://tecnomatec.cl/upload/file/9316764950.pdf In PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/83321425623.pdfIn PDF document text
    • https://signika.pl/Upload/file/wevaxezegomemuratakopezom.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/93986394506.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7645552db10e9b12eeaeb0581a72e27f/duxotisigefifojodizi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/sutisolimako.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/tizojaw.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/71343207137.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/78928570518.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/9070031922.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210912_0EB08A8CB069AC95.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/fanawuvowur.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/wuxogudagoxasurunub.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/93167845019.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/85489389094.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/uvusuzekakoxagomiwatoku.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72976683138.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/tolasebinabeton.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/60105456799.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/neluzovidejadamisos.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/fofinixeremo.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/bemimamozawe.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/36740772074.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/56895534321.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15e4cef58---78884573442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rs+file+manager+pro+mod+apkPDF 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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 10880 bytes
SHA-256: 3841df25de945f27a5bc4476da0735ccd3402ae2d0b166cdac96decb68469516
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 18920 bytes
SHA-256: 3cbfe9c89010238a2e0a63ae92cc99240c891251d6f18ba3755adaf71a07cfa9