Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d759aadafe8e6e…

MALICIOUS

PDF

67.9 KB Created: 2021-04-05 06:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ce8425dd35bbb00edfa203e8cfeb30d SHA-1: 1bfeb5321f0a663037ed9ec6043e0c43423ea5cf SHA-256: 35d759aadafe8e6e247b7bc4c0c00cb2ddb83886230b70bd0781d4e5f3a969ba
156 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 0.9998

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 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.
  • 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://soxebez.ru/wix?keyword=climograph+worksheet+packet+answer+key PDF link annotation
    • http://goods-amzon.com/pegipj5yuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_6054cd4b3fc46.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/HjiqgdB/castaway_cay_disney_map.pdfIn PDF document text
    • http://aduo5.online/pixar_storytelling_rulesmeqyu.pdfIn PDF document text
    • http://azakalaza3.xyz/civil_war_maps_gettysburg_battlesp51i.pdfIn PDF document text
    • http://5coupon.info/3992834386fiv9.pdfIn PDF document text
    • http://fruitik.space/bonfiglioli_vf_gearbox_cataloguecvtx1.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/gCLZTJs/geporefosugokorezalalob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_6016961ed0645.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/sojaxub/indian_air_force_non_officer_ranks.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/twitch_prime_account_information.pdfIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_4971829ef78943be9f326e37e447cf64.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_fe0ba23efd0d4b4f939c3b049fab64c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/96130183930.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/cardiologia_veterinaria.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/toyota_camry_xle_2009_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/cetis_54_uniforme_2019.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_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 5508 bytes
SHA-256: 84ad9ba29e3fa35acc45e43dd9a1ad048edc3377f276a9dae80798fbdccd9b84
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10388 bytes
SHA-256: 0f8d14fb48ea8fbd9727a50a2dc0671aca95e5525a0d4af29adc66e742a0c3e1

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