Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4e22c036d2b250…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 01:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3c87c1ff501b691e9471e4044a43a007 SHA-1: 51f5cc7907ba148e39ff4bdd8bb0c328587047a3 SHA-256: ba4e22c036d2b2502117ddc72810dc4bffd50da39002893129340ba8e18fcfd2
134 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. It uses an invoice-themed lure. 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 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=shein+promo+code+2020+april PDF link annotation
    • http://rimarilomikozu.medianewsonline.com/jojugibagudarizufo.pdfIn PDF document text
    • http://instapriz365.online/givusevoxobavacpw83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_605bb893eb56a.pdfIn PDF document text
    • http://sandiego-podcasts.com/what_is_meant_by_enthalpy_changeno8gj.pdfIn PDF document text
    • http://ita-bio.fun/58621782846498c5.pdfIn PDF document text
    • http://amandeepsadyora.com/how_do_i_get_my_panasonic_phone_to_ring_longerrkbrf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_605b91de0dc2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499673/normal_5fe75904a786f.pdfIn PDF document text
    • http://detonic-official.website/ringtones_for_android_download_mp3kbifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_601448d583921.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowobovu.myartsonline.com/neumonia_en_nios_2020.pdfIn PDF document text
    • http://tefepibitu.rf.gd/wimazerarotavepawunow.pdfIn PDF document text
    • http://xevijojikutep.onlinewebshop.net/mn_drivers_license_renewal_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396a10aa-2bb7-457c-8be9-9f0a31fdd165/96473512240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45dc585b-5cb1-4437-959f-cc9955d5c957/reading_strategies_for_high_school_social_studies.pdfIn PDF document text
    • http://gaxapasu.rf.gd/panasonic_bq-cc17_blinking_green_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0063824e-57fe-43bf-928a-7d59e1ece1ad/gotonusezuvazerasig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ee481b-f635-438a-a250-180f66ebaf85/how_to_start_your_own_market_stall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a955d0f-f2e1-4c77-8d14-3fc38de3d59b/used_bose_lifestyle_48_for_sale.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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 5512 bytes
SHA-256: c0b92754cdfd77db188eefac603f3e6c99fe0c7c0167922c3c081c2ef85c4f15
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 11076 bytes
SHA-256: 0aedd7e1f0a7fd216c9cbb5305f69cc4dce8f3b138e8b44da96bb8510c398a24

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