Malicious PDF — malware analysis report

Static analysis result for SHA-256 de39566d16312ae8…

MALICIOUS

PDF

83.1 KB Created: 2020-12-28 08:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 92a15c24df18d57bce4a0ba6407db99f SHA-1: 9cc431aeca965c454c5aa85f64de5e03e5e3ea36 SHA-256: de39566d16312ae866f24478a468aab36ee0e5aab14ee698de0c2a8e61ae13eb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The file contains a large number of external links, many of which point to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. One embedded URL, 'https://trafftec.ru/aws?utm_term=azur+lane+pr+ship+guide', is likely part of the lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafftec.ru/aws?utm_term=azur+lane+pr+ship+guide PDF link annotation
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/redifojelubok-popowodijewesa-tidizetekar-depomufibasipan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fbf7c8260ad5.pdfIn PDF document text
    • https://runewabelew.weebly.com/uploads/1/3/0/8/130813516/38618dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f928ebdbf42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fd8f12e4edd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fe2f1770e9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fbd40d21792c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fd7c77beb1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fe7304e36ad8.pdfIn PDF document text
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/9302055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/acura_nsx_2018_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/3d_to_step_converter_online_free.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_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 5260 bytes
SHA-256: 4bf5aa7ad70f7f14d0438ce84efdca1f44a94b3000eb3d22b97b4d05c28066a9
font_01_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 11328 bytes
SHA-256: 36f1feb604d98299aefa457cc7a8a60e6d60bf79465c815b8775b314114f38f9

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