Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6711bfe43bb83d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-28 01:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5622d5f9045c433da8d567bf5a41c424 SHA-1: 52d573bceb52d154540035291ff61918215e671b SHA-256: ec6711bfe43bb83dabda28f278b6328c9b2115073d75be9676d90bf5916bbb2d
186 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+start+advocare+24+day+challenge PDF link annotation
    • https://cdn.sqhk.co/waxuniwite/gOk7jEy/36340133067.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/briggs_stratton_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/ifn1Nhf/sarutemop.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/ekcHvhc/dual_monitor_backgrounds_4k.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/alcides_arguedas_raza_de_bronce.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/88051547175.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/mgcjhdX/33258957263.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/jilenuze.pdfIn PDF document text
    • https://cdn.sqhk.co/zalogifewoje/Agehihc/bakiloroperusigevawug.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/qhi4ifw/15017284476.pdfIn PDF document text
    • http://votapusi.mypressonline.com/healthcare_data_analytics_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_a527954d78c845b991b4ea5b5cdda125.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_b5dcbaccfd1f41c9a5796af74324d787.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e54ef3-3924-4b2b-818c-1099dda3157b/logulubuvofisaviwan.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/artemis_fowl_graphic_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/14017936252.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/gagikitufadulamenunagaz.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/indonesian_to_english_dictionary_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c344dde-586e-4446-958c-3967691bfdc5/how_to_turn_on_taranis_qx7.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_d3c4acc8953b4dec94a8c53d769f7020.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/como_rastrear_mi_android_robado.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_91949ed804b24cfcabd19dd9a8fe0fcb.pdf?index=trueIn 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_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 5636 bytes
SHA-256: 42c9d53bdbaefdc1a690ee135950d45e3fbabbedc9a2996d4d97a650a978a3eb
font_01_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 10584 bytes
SHA-256: b9b503396ef90924077e959bed7b3fe43bc99bb76a01b3759f43b3642f187fb6

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