Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78bc839ef621b43…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 22:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0224461feeecbfc598afcffe3fa1eb9f SHA-1: 33b4a0404a92368f36f77eb0333c4792d2a77c55 SHA-256: a78bc839ef621b439f15b4df7fb75c8ba6fd9e301e91f392de7c041b6834622d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation tactic, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://bidwoodmachine.com/d/files/wazaladijilen.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/pobunewaj.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/bizopi.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/60497260296.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3977723715.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/viwivopuwedudesu.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/nosutizubosivi.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/wujekazuvekupirunudota.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/76560650558.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/zivejelananatigiro.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/nuxajudiro.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/3386695025.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/julifakawipamizoludonatoj.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/ligajiwapesijofavoroguzor.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/mifesajiwajopif.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/50009741012.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/6810277852.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/32866801052.pdfIn PDF document text
    • http://abpaluso.com/upload/file/43719099650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chal+man+jeetva+jaiye+2+watch+online+freePDF 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_off0000bffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 10980 bytes
SHA-256: 25387b5fda24ce11eea3d478d1e1784f6b61fc444cc4837c633d40a49cf4b356
font_02_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 17792 bytes
SHA-256: bef133024a624ad850f42c63c8d0416adec44545d8bf155914d3b241b7b999ca