Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd70e58833cba5ba…

MALICIOUS

PDF

79.7 KB Created: 2021-04-07 20:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 031db63cfd5859f1640d6abc4c1d9979 SHA-1: abc93ce70ef52655b9150be41789cbc3afba0c63 SHA-256: dd70e58833cba5ba13327cccb9724a432876a93d45789d80e0ded5b3eef87f53
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to 'How to use a kindle paperwhite 2018', which is likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+to+use+a+kindle+paperwhite+2018 PDF link annotation
    • http://swiss-gear.shop/popular_ringtones_2019_download_bestf4hri.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/lovarokowkcos8.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/14143448252.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/gunisutapov.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/jagjhdt/28581696750.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/DjjbBjf/seashine_secret_fish.pdfIn PDF document text
    • http://kraftmann.su/used_nordictrack_c2200_treadmill_for_salend5z6.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/mewujuvevibepasuwuw.pdfIn PDF document text
    • http://bogplaktnc.fun/626839687793v0yq.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/EifCejj/ben_10_alien_run_game_hack.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/statistical_models_data_analysis.pdfIn PDF document text
    • http://salonlabs.xyz/bimumukufadq6498.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://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_fe7af3c46c2348358e45452b6b8196ee.pdf?index=trueIn PDF document text
    • http://rugefar.myartsonline.com/descargar_adobe_acrobat_reader_dc_gratis.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_01f040fddd77493f96c833667744197f.pdf?index=trueIn PDF document text
    • http://jirabasojexosud.atwebpages.com/42637928245.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5568 bytes
SHA-256: a52ab42d7c68e5086e31166767e8eca4e31efc59189980157ddf994e70af11e4
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10416 bytes
SHA-256: 05a3cebdfa94f2402a4396bf6dc39f04983d607690bc67d4c968af82ec9894bc
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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