Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8cbc24b4481395…

MALICIOUS

PDF

74.7 KB Created: 2021-03-18 10:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f9602856e3b17fd42833c3d95b5c903 SHA-1: 005a79517dad44cfac85075a2e3149a621fd50a1 SHA-256: 4e8cbc24b4481395cd01349259e72f8b9532c0d30c4f9ee5525b69c12f6b1b70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://leonvi.ru/wix?keyword=my+boy+emulator+download+apkmonk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470839/normal_60463ce82019f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_6006b6d4dc732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5fffb175a6566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_602ef5ca6116d.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/42702509323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_6047d941676da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495550/normal_5ffd9a164a48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_603140205a3c3.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/rebigizeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369633/normal_5fdd28f906d5c.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/instrumentum_laboris_amazon_synod.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/43323824536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_603346c753b30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5feb4fc78b770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5fd9387e47acc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/794e85de-0579-496f-9e90-2e9d9fea201a/attack_on_titan_game_free_play_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6b3fa6-a43d-4704-97fc-2489a36b0832/toxiguluzut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c685ba-887f-45cd-8c47-26d73205f47e/laderugojorijitomusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1476b8-6d0d-4798-8217-df711bc0fb10/singer_4423_heavy_duty_model_sewing_machine_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146c9bc9-d2bd-4876-aa30-e20d19cc2708/jamarefozun.pdfIn PDF document text
    • http://rivuwasiwitovud.rf.gd/niwaxaxaraxigoxifinuzu.pdfIn PDF document text
    • http://wuvasof.epizy.com/desarrollo_biopsicosocial.pdfIn PDF document text
    • http://pobuwejugu.epizy.com/can_you_eat_taco_meat_on_keto_diet.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 5332 bytes
SHA-256: 2a01628b698b357ed4f1977002cf4cbc0eb2beae1331f0d65c0f8fe665927487
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10668 bytes
SHA-256: d09aec1c66e87f792f94bc6d2033f45ee145cadb9f0696df20a5db72eb4a1385

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