Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec96dbc70967a568…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 06:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 895f00ed18f6a7cbdc58bbe7d133a482 SHA-1: 0f78188518542d8be4065a278d5c5297c4b752d1 SHA-256: ec96dbc70967a5687cc8dd6b701f8d81eeb811b201162ee04d043f04f0d72e8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which appear to be part of link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's likely used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://wastran.ru/uplcv?utm_term=city+car+driving+android+game+free+download PDF link annotation
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/levere.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/gomufafek.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/70770227945.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/41262447fd196acb826ce2ca069b6315/samusoso.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/51409705465.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/2926126912.pdfIn PDF document text
    • https://10fci.net/userfiles/file/71623685428.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/lafopejurenikumiru.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/90137670055.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/59464685922.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/96906690684.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/42538560651.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/81296344642.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/70869076391.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/13320997904.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/41543834098.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/pirafukimipu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161490366768c1---56198029690.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/pijimatowofizigevowa.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/46629039681.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xorinofevuwaxatutosegam.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/7363429846.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/50057830640.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/koxibuluju.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/66199266732.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_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 10948 bytes
SHA-256: 4e08f7780d2c2cda3db0aa4f2205ff709c3fd2f8e1960710f0c178ca51aadf1d
font_02_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 18104 bytes
SHA-256: 0eeecfcd4f65e6e9400842f98a8b9d4f9ea1c369ab006c51460c896a10b75e07