Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3556a98820f9c69…

MALICIOUS

PDF

76.0 KB Created: 2021-03-26 19:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eba746d60f1b8eb84f07766eb11bdfae SHA-1: 2258705fd324b1f971a37a690a1b54edd28c1aa8 SHA-256: b3556a98820f9c69f7232c99efdf7bdaaca828d2b99b8d9ea2012ddf4de5833a
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 0.9993

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=swagger+offline+editor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491934/normal_6034bfc9c7b98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fce5e6541125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_605b3e120e4c5.pdfIn PDF document text
    • http://boxberry-24.cc/360942281647mp1u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478669/normal_5feb60f55c0c8.pdfIn PDF document text
    • http://7lessons.site/502671784730tyza.pdfIn PDF document text
    • http://marketes.pro/adagio_in_g_minor_sheet_music_violindocxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_6038d536cb22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_6046fee35c253.pdfIn PDF document text
    • http://tlgfree.xyz/lavuritvh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_6047047e5744a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_60230023492c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_60410b2f1bbe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_60571a4cc1a08.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/hjehiZ0/pdf_file_compressor_software_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5fc7ebc460129.pdfIn PDF document text
    • https://cdn.sqhk.co/zowajomi/jgiaghc/thimbleweed_park_review_switch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_600b39282256d.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/defipedibe/35477369937.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/kogekujomivede.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/tatudutuba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 5092 bytes
SHA-256: 72157535432b84c417cf76de95b2055fad0c1b574cfd8c1b5942ec285711cdce
font_01_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 1800 bytes
SHA-256: 821686f2c53b22852e57f3492f6fc1578ee53e2ed00518c917c505b53407640c
font_02_sfnt_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 10380 bytes
SHA-256: b28a1f84372be3264a019f8dc372a8249b77d42b82af555ef586eeea0902aab6
font_03_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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