Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b67d5f3375ca3d…

MALICIOUS

PDF

87.4 KB Created: 2021-03-12 10:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 678e184f25ae79ecadb739e5dfdeeea4 SHA-1: dabd020dc916ace0a465402bed4329b24b00f7dd SHA-256: b9b67d5f3375ca3d8d7f998714964bb88e3fb343ac176d01f66e8c989e4f1bfc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://baarspo.ru/123?utm_term=arcgis+engine+9.+3+developer+kit PDF link annotation
    • http://fomizedo.iblogger.org/41268824414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_5fd63d013c141.pdfIn PDF document text
    • http://fonabibexame.iblogger.org/introduction_to_machine_learning_kubat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5fe1161459749.pdfIn PDF document text
    • http://fruct.space/what_are_the_features_of_arduinop70qx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_6019367c885eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_604626f339f91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5fc91230f0299.pdfIn PDF document text
    • http://worldhold.online/20113231744cofqi.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/e4fd1c4b-7965-49c0-b2f3-f7dabad92b36/active_and_passive_voice_formula_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/backup_android_device_to_onedrive.pdfIn PDF document text
    • http://batawovajupofu.rf.gd/chromedriver_win_64.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/kimapopadokuwuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af5d640-24d7-4c21-957b-49454f488d68/this_is_where_it_ends.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_6cec5d1c00f24c45927ddba24c17442d.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_f717c3e664cc4c428b23f9b4f57cd560.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3312cb-b854-4a66-8f16-c3c671186423/mujebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281266f8-62b1-4fd0-9430-de49df9e1a19/85207657610.pdfIn PDF document text
    • http://jeputujakajaj.epizy.com/counter_strike_pc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 5496 bytes
SHA-256: 15fc799cdacbf1864413cdb8c248d4e00f5aa640bc60a374047c438d4a4f8f7d
font_01_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 11228 bytes
SHA-256: ed03537a2599eeb4251a30030e6d77fe2b8eec8bd2becec8573b440e1abbdd8c
font_02_sfnt_off00013a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A88 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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