Malicious PDF — malware analysis report

Static analysis result for SHA-256 d633a68eaac45dcb…

MALICIOUS

PDF

68.7 KB Created: 2021-09-18 18:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6067671ecd6008c6d209e64c260f5df SHA-1: 643b27fbe5d82468a27cbbff65ece168dff69089 SHA-256: d633a68eaac45dcb75b18ca08421731092b9be58c75a503f820d1d6b80466d5b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its image-heavy nature and embedded clickable actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF acts as a link farm, likely directing users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous unknown URLs suggest it's part of a broader phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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 http://myarrahnu.com/mo_images/files/xosuxugibasirapa.pdf In PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xatejoxibojojomere.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/7267926206.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/punifupivimokoginuxafex.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/nekusozarupojejazepuruvu.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/8733549457.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/zuvexebivatud.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/fosobirevub.pdfIn PDF document text
    • https://istanajp.net/contents/files/lupibixijeporime.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/71017290765.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dowirumaxiluzelujuvila.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/puretesazazo.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/42468683116.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/xoduvowinitisisa.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_CDADF7327DE58BC4.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/41575260031.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/migemuwazaked.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/titipisuvaga.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nalolamalunevogisev.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/selojixomunapitukafem.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136a83b999f0---53508076089.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16728111866.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/56994926561.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/63560070141.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/21607866155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=comunicacion+organizacional+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_off0000b10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 10756 bytes
SHA-256: 9f14bcd4dd529462e5108741da62f1dbacdf2331e47341e8bf38bd917c0efae1
font_01_sfnt_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 14184 bytes
SHA-256: bef54b34a1a508539a761afbe1be0735389913746a65efb32e8155bdf657762c
font_02_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1