Malicious PDF — malware analysis report

Static analysis result for SHA-256 e158de0350985b4c…

MALICIOUS

PDF

74.0 KB Created: 2021-03-02 11:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e729a36629a66d3bfbf6c62e979dae63 SHA-1: 18a0ad18d152b1735396a0333b2e1c890f84efbd SHA-256: e158de0350985b4c4cdc876c04989870bb197c7096c002f09917af64cfd5addf
126 Risk Score

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 0.9998

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://dugedepap.ru/strik?utm_term=acido+cloridrico+formula+quimica PDF link annotation
    • https://cdn.sqhk.co/riketumes/hlEifhf/rally_as_a_noun.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/ygegfZr/bluetooth_car_diagnostic_scanner_amazon.pdfIn PDF document text
    • http://tersq.space/mujatinalevafazizojerodetikklv.pdfIn PDF document text
    • http://ig-copyrightviolation.com/libros_de_magia_negra_antiguosi6f0a.pdfIn PDF document text
    • http://dirtygirl.fun/english_grammar_test_online_free_with_answers7pe2k.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/zawenowafovujawpdo9d.pdfIn PDF document text
    • https://lafuxekezijunu.weebly.com/uploads/1/3/1/4/131406487/sawewo-votirimi-bulivo-jamovilikuwav.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/70172664263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480402/normal_5fc9917b9ba5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_6027a397d8446.pdfIn PDF document text
    • http://ewwe.space/afcat_answer_key_20189kyrj.pdfIn PDF document text
    • http://disozire.mygamesonline.org/fijovegenu.pdfIn PDF document text
    • http://fenellalucynelle.info/swiffer_wet_jet_pads_how_to_usehygfd.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/supply_chain_management_mba_salaryx6iv0.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/8716bd0857a10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likutolejit.onlinewebshop.net/yamaha_portable_grand_dgx_640_price.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/fiber_optic_communication_book.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_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 5104 bytes
SHA-256: a5e931b8aecb5e4b7ff265d8ccf8154715c5da97d6ee937c7292098373e43273
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 10936 bytes
SHA-256: d82e14385adfddc3c1c7414db3464de3c4b9037f9834be5ef55d4953c44b91ee