Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea30d4c645e5c12e…

MALICIOUS

PDF

119.5 KB Created: 2021-04-23 03:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c2fe31ec46c5458f40c0f2d383bb9d4 SHA-1: 1a2f92483eac5e1046864d293e272ae16e2c6522 SHA-256: ea30d4c645e5c12e58491005970e3bdec4b8bf99d209d6552b1b79c8b7c87ef4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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 https://soxebez.ru/strik?utm_term=next+to+normal+natalie+vocal+range PDF link annotation
    • https://cdn.sqhk.co/satidaruxami/ebjbha1/sushi_hachi_dc_menu.pdfIn PDF document text
    • http://gatorama.fun/smoky_mountain_series_smokerwmzmw.pdfIn PDF document text
    • https://vivusujode.weebly.com/uploads/1/3/2/6/132682813/87cd0fca2a.pdfIn PDF document text
    • http://teachost.com/buddhism_in_vietnamof55h.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/c6faca5.pdfIn PDF document text
    • https://kukegogefip.weebly.com/uploads/1/3/2/6/132681459/a5eee446e49a3.pdfIn PDF document text
    • http://sehq.xyz/facebook_app_free_for_applex2rjm.pdfIn PDF document text
    • http://lighttravel-ng.com/abstract_algebra_a_concrete_introductionvhazj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5feba0afcea3b.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/K4jcjdR/noblemen_1896_mod_apk_unlimited_gold.pdfIn PDF document text
    • http://present-mag.ru/xizefimaruzulipamupao4x6m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_6006b725caa1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fdb30c98713a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_43f26e6f45b84a9f870794afa9d74055.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_10b88761bc1649fb92771d98259076b6.pdf?index=trueIn PDF document text
    • https://d5775bf3-09eb-4776-b235-d2f4d703d790.filesusr.com/ugd/205ae4_abb33d75b3464173959970daa8ac98e4.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_8c1c43b4a96c48dba4cb2232c4deef34.pdf?index=trueIn 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_off000173f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173F9 8856 bytes
SHA-256: 4a8eda60318e7c6f945f9d476f47de3c840ca0e8b3973a19ef21c0d94be6d220
font_01_sfnt_off00019186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19186 5040 bytes
SHA-256: 7005bbe5ab758b03315aeea59c6ed5b1471795bbd2ab40a6fbb3dd58f347e5c1
font_02_sfnt_off0001a29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A29E 15204 bytes
SHA-256: 57e25e8886676562666af103effc4d08286f5a48d1a72e3843bcda4b6813aba6

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