Malicious PDF — malware analysis report

Static analysis result for SHA-256 044e532841066216…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 21:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 045412cbce962fdfb81a29b0802db9df SHA-1: 605d6ac9bde54302f19375f2c6e1e7e10f3fabfc SHA-256: 044e532841066216fd67a5d0101665556ff72098db89eb75a9d0516ad6b902e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDF files on disposable domains, with a high number of distinct hosts and links per host. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://iqmuseum.mn/uploads/files/73605032686.pdf In PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/55450807731.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109090628524255.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/bakezediwaxim.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/75984974766.pdfIn PDF document text
    • https://value.ae/userfiles/file/17124846975.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/15701546628.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/3465845275.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/89442052271.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/gejivaso.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77677308971.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/75467923172.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/77716828085.pdfIn PDF document text
    • http://hrudolf.com/userfiles/89818755797.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/65689713603.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/75574520357.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/12817676184.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/16750126209.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/bogobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=email+server+settings+androidPDF 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_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 10640 bytes
SHA-256: 257698357b3c6f46e4fe42224e1dc1d972ba5332b9a6ca5cee835dfc3b717bd4
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 17796 bytes
SHA-256: f6b8e508446ad5e519fb1cdf2489ecf469440ceb704059d281c686db7a8034d4
font_02_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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