Malicious PDF — malware analysis report

Static analysis result for SHA-256 af608716c10de2c5…

MALICIOUS

PDF

95.8 KB Created: 2020-11-20 07:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4f7cf28a6e040b8f5de554a32dc27e29 SHA-1: c5bfcf83c8a7fd0d9705722b6478d6a633053af2 SHA-256: af608716c10de2c521d7f50d150d1b26f5fc209b0425dcda555c47f2bf9f0342
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO scam. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/aws?utm_term=desh+bhakti+song++free PDF link annotation
    • https://darifojiwuz.weebly.com/uploads/1/3/4/5/134588766/fcd588234d9bf6.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/9826c.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/pepifotexij-wurukuleka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5f9208526520f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f90db5940716.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/7043491.pdfIn PDF document text
    • https:////a10.gaanacdn.com/images/images/albumartwork_large\/22723\/crop_175x175_22723.jpg,parental_warning:0isSponsored0,isAv_ad:0In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/97557752568.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/subway_stockdale_hwy.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/a_cell_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/wupalotabonifimuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a4d808-274a-4e70-a60e-419f86b3b4f5/88680371478.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/nujiku.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 5200 bytes
SHA-256: ba594b0d255f1c32b4f40326720564e7824f95cae9be9e8c502f504869ad96d6
font_01_sfnt_off00014708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14708 13856 bytes
SHA-256: 642b915f70d2f9c04e105465a8fa84cdad94a5158cba53521d99331f3d67b431

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