Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52aa4f878601628…

MALICIOUS

PDF

78.5 KB Created: 2021-02-24 21:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1538bf80afd50c15618714a5a42cd450 SHA-1: 0f2e1b7daaa1c6b66b7cf7ef1fb61245b2f914c2 SHA-256: d52aa4f878601628e068ce69f2807b80a012ccfa09912c0fb870a7221ccc9d95
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=photomath+apk+mirror PDF link annotation
    • http://autobuff.xyz/8307097967xwjiu.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/haiiIHB/metal_soldiers_2_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/iY2logY/semodokolar.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/9641494.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/jUhgja5/my_rabbit_keeps_running_around_me_in_circles.pdfIn PDF document text
    • https://natapuwofase.weebly.com/uploads/1/3/1/8/131857101/3803746.pdfIn PDF document text
    • http://stopro.store/38859347465n66fd.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/3085f3d66.pdfIn PDF document text
    • http://sweetygirl.club/el34_single_ended_amplifier_schematiuvfn3.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/gfiejfq/17715260176.pdfIn PDF document text
    • http://testertumentum.space/which_of_the_following_is_not_an_example_of_verbal_communicationeu311.pdfIn PDF document text
    • http://ekzo-fruit.ru/vegetarian_keto_diet_plan_for_weight_loss_india2qni2.pdfIn PDF document text
    • http://koteyarn.moscow/avadon_the_black_fortress_walkthroug26092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fd906ab65ee7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 4916 bytes
SHA-256: 53e4db7f6ba3151a164dd761755800ae26265a869fea4e298c98c409879947c9
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10796 bytes
SHA-256: ee8b57e7d38ad3e464a3d8516950d77863d07ab3d235bc5a71fe5ece7e3c3bba

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