Malicious PDF — malware analysis report

Static analysis result for SHA-256 924dcef0e7518f07…

MALICIOUS

PDF

66.9 KB Created: 2020-11-13 16:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6d208b9a27456e16a9e88368987235d9 SHA-1: 670d532e775380518a80015c87c3aaa29a3b5355 SHA-256: 924dcef0e7518f07e7ac847b5bae72166483c2d713b87f6ba107acbe5f7073ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body, though heavily garbled, contains references to "Black Desert Online" and "guide 2018", likely serving as a lure to attract users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://trafftec.ru/aws?utm_term=black+desert+online+class+guide+2018 PDF link annotation
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/ea180ab19.pdfIn PDF document text
    • https://juzatimeb.weebly.com/uploads/1/3/4/6/134605854/kemikimuzaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5f989ea9b9f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5f95e7973d949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5f9c3fdc418f7.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/goreludopodu_bevoxalan_fanalavugixigim.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/gatipaliwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_5fa8d1c5be444.pdfIn PDF document text
    • https://sowuritujozefa.weebly.com/uploads/1/3/4/6/134621612/3911479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a118155-f37f-4bde-832b-746ca4b9e518/27550559508.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/kaxufunivimufob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de9c699-fd2c-4c36-863b-532d5c0635b9/84305536497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45c38c8-6dce-4ee0-8aea-3b9daee4b3f9/jimiralixoduwojuxasamimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8f57ac-7e24-4970-8ce4-9aa40b208036/big_ideas_math_advanced_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4e7c00-b1fc-4a70-a1ec-2b0b14e1c7a8/zemefonanatisogikat.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_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 5740 bytes
SHA-256: 144cb9001e62498dfc408cf9de76cb4fc98253116f8014138d0fe7e9e23b6b2d
font_01_sfnt_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 10144 bytes
SHA-256: b5a13d7bb04aac03b7c4e65d307ecbc8fe78e56f7e5e237c889668750df34a60

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