Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9aa6d3498b019f…

MALICIOUS

PDF

74.4 KB Created: 2020-11-24 08:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 46eb6c509036483e3543330740cc79bd SHA-1: 9626e1d0ae8401afbdeffae8e8558f21b593936d SHA-256: fb9aa6d3498b019f02f1d08b8fd4767d29aa773eacf6bdf9c69e1365ee741f13
214 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 multiple heuristics, including ClamAV and an ML classifier. It contains numerous links to external PDFs and a redirector URL, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to marketing research questions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://cctraff.ru/aws?utm_term=marketing+research+quiz+questions+and+answers In PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/4fd30b.pdfIn PDF document text
    • https://bakukumi.weebly.com/uploads/1/3/4/4/134437371/zekajerixujutagezaro.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/4d73f922b27.pdfIn PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/zazaroba-bipaden-sulozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_5fa43baa36964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5f9c7b2362395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5fa02f4303032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5fa3b32fcd0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fa7991dde4bd.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/kalanejaxutilif/big_maxx_mr_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/83326498457.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/burr_coffee_grinder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/nejobopidipi.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/lusanetutaze.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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 5388 bytes
SHA-256: c68689e37383dfab841f31d9a6ef67a5529ed08de10dbec7defaac2113807e33
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10664 bytes
SHA-256: bb399feefa4f5df2ae026526ace4d72f952c17e2f5cc717de25bbf7e0ca4151a
font_02_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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