Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7c082758a446d2…

MALICIOUS

PDF

80.9 KB Created: 2020-11-12 15:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 991148b0dc19b96056a691a85473cc74 SHA-1: 35e9346ee7f7393e872f16d1d56f2b371fc999b7 SHA-256: 5f7c082758a446d2ba5fff144d17cd64a9cb770785eef8c44b12eabee9b27ccc
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one to 'trafficel.ru', which appears to be an SEO redirector used for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Maplestory', suggesting a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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/123?utm_term=maplestory+hyper+stat+guide+pathfinder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f938477bd483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f88b119c01a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5fa2678356d8d.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5fa5ee18537f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_5f91009c0c1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8a10334fa80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_5f9f699004266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f8f0620d3aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f9b2d6f67fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5f90f9904944f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5f9452552fab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5fa364fb7da6f.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/luxelula/sigorutegi.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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 5292 bytes
SHA-256: 68c9ef67ab0daa5962b66c1858e71cf5443b122e703e3516d50a2c3dcabb6b6b
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 11284 bytes
SHA-256: d5fb3db2fadd307f700e5d55b283f1cd123b20fdc62be5229ba2d27d61cb7af3
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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