Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1a803a2aef25ce…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 15:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56fa21947df41b45eed6df2131686206 SHA-1: c66392fe4c351bf6fa835b158389e4fdbc9cfd8f SHA-256: ad1a803a2aef25cea1f8c2834cf0d482f8288fccd9b948dec0aebdca63993706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of external URIs and the overall structure suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=keyword+phrase+generator PDF link annotation
    • http://4yoga.by/pics/files/zamabudilonuvow.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109041931069541.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/15274386861.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161386f983e414---koder.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/kilokukafuxinevage.pdfIn PDF document text
    • https://majubesar.info/contents/files/79611561551.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109052301341655.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bdbfd1db1041cd637db0489f8aec0782/pisowasevovi.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/lavewajewezexe.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/golatikuxitafunox.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/diker.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210909223048.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11703846194.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/86641649349.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/836786219.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/15489260318.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/pixoduwejagosatake.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/53598258478.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/wepedesabonoraze.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/79245625978.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/peverej.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/pivibuwozebifigunuxudila.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gutot.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19863666613.pdfIn PDF document text
    • http://evola.it/userfiles/files/gafibewimo.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/22457564066.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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 17964 bytes
SHA-256: 1dd1a542ed73f06263862c600878fff4a5a760b588cf4cff3369ea1d01f14a27
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 10724 bytes
SHA-256: 72e3cc4192276ca5890f723342641aca62b371c15cf416ac18e9de1d96f1546b
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1