Malicious PDF — malware analysis report

Static analysis result for SHA-256 65674b751eaa6529…

MALICIOUS

PDF

70.9 KB Created: 2021-04-08 02:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 692bc2aefac0a6e0afd79ddb33db4d2c SHA-1: 703e04a77e52224a6824a4c150598e083fde5c23 SHA-256: 65674b751eaa652909ce8e7ca2aaf7427f5f4650a671a875f318c99963c133bb
156 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 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=biology+semester+2+course+review+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385197/normal_5ff6992ccd4ee.pdfIn PDF document text
    • http://tomorubi.22web.org/jewomiguso.pdfIn PDF document text
    • http://sayfelengs.space/27899330011gbvpq.pdfIn PDF document text
    • http://pavawafupef.66ghz.com/pacific_hydrostar_pressure_washer_1650_hose.pdfIn PDF document text
    • http://ipoteka.net/zojirushi_bread_machine_bb-pac20_manual8fzal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_605c36a6a667f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/bawulolugumogabosi.pdfIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_3cbf1539f6cf43a191279c5223e5f3cd.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_0169dc29186b40c2b13942fe745c1f74.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_4aee6d25a5a943dca00fc001c3c55005.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/cameroon_visa_form.pdfIn PDF document text
    • http://kogorokexo.rf.gd/40136743922.pdfIn PDF document text
    • http://sajajokoxisuke.rf.gd/jamexevufadozugeleze.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/fundamental_analysis_of_stocks_online_course.pdfIn PDF document text
    • http://popaxaxi.epizy.com/linikufuwedojejidowopimi.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/54568652651.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_4448efbfbb664bae9f529a5a5905ba45.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_f8953505fc4d4888870f9306efb11a64.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_b40ce32566f5464fa316a8ff7d7e98c7.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_8253c5b18756482c893291e411544359.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/pak_studies_9th_class_chapter_2_in_english.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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 5552 bytes
SHA-256: 6f510ea2e8ef0e6e8ec7c038c273bf13e447edb6c1f0a3a4b9780d994ec65e41
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 10236 bytes
SHA-256: 257f6e4809fbff7cc93dabd2a5523f6832f2cf4fc3c5ea9cd7b241053ac29e79

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