Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e6c8c383cf5a67…

MALICIOUS

PDF

66.8 KB Created: 2020-12-23 06:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 36c119ce5d30df82bc9bbe43675ac135 SHA-1: e02488aa2df658044b05e9c299e4d48e44cd1f05 SHA-256: 00e6c8c383cf5a67d00dabb818af44e34b5c55def57e3e92acc2375a0e8c54b4
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm designed to appear as legitimate SEO content. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/123?utm_term=waking+vigil+god+roll+pvp+console In PDF document text
    • https://static.s123-cdn-static.com/uploads/4496616/normal_5fe29d5d5fc76.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/zumilal_wapotimoxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5fa5ff16a2a92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fefurorobumi/zunogaluguraxi.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/mololu.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/datimefobenirikobaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/mapezinujeju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b0d2239b0722913ccfbe/t/5fc7542756cd4459b3b68803/1606898728226/jazuxaxutivuzikevuveba.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/battery_saver_android_root.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 5084 bytes
SHA-256: 7bb8fa0e2d7be2db48088bb4180d374f25e6b2c9349df19dfce094e29fa78d69
font_01_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 9816 bytes
SHA-256: fe9671cecf6379112a4eb3145f80a3675522def1123989d23ab397e3194cd217
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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