Malicious PDF — malware analysis report

Static analysis result for SHA-256 9257a1204a4db5cd…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 05:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dc9f120ae9c92751aeacedc7a8f23cca SHA-1: 5afdcde7821933a11d4d982718ba3e651a9b964b SHA-256: 9257a1204a4db5cd43f5e42e19574333942b76bfd20bbbccde6de8d420ec1012
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 0.9998

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 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://xezojetit.ru/wix?keyword=awesome+internet+games+unblocked PDF link annotation
    • http://albl.ru/active_release_technique_near_me96f45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_604168458ec9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487632/normal_5ff8a098bbf0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_601f96ccad245.pdfIn PDF document text
    • http://biggymstoe.com/mopusigovik0amuc.pdfIn PDF document text
    • https://nolenefin.weebly.com/uploads/1/3/4/6/134629259/fodogowokekiw.pdfIn PDF document text
    • http://domensita.fun/quotes_of_ram_dass8yaia.pdfIn PDF document text
    • http://fdvsefwfrw.space/54653520057zmhp7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425921/normal_5fcd3501bf0b6.pdfIn PDF document text
    • http://vnds-super.space/gorivewomagabubewugase0xddu.pdfIn PDF document text
    • https://makigutezun.weebly.com/uploads/1/3/4/7/134707077/5460265.pdfIn PDF document text
    • http://miiliioner.xyz/gewetekqvs2.pdfIn PDF document text
    • http://electriccannoz.club/35625783137czzl.pdfIn PDF document text
    • http://buytoday.cc/dosesitorigumobulavef.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/4d5e8caf-21a2-43d4-9e08-5c2c40ea2a3d/73645897093.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_e40d61ab7b184963b0e3e36d064ae007.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd40a1fb-284c-4a44-97a5-5b300df2616a/charles_bukowski_go_all_the_way_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841e57cd-affe-4cf3-9f54-808332edf9ba/53442204502.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_1d032f107edf46c7960ec34e124ef209.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 5544 bytes
SHA-256: 66a74ccffebdbb6388ed77f272f370318633c53fae7ae774bfb635d8f99eb842
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 11776 bytes
SHA-256: a73ebe45ed2e2681f9a0a2f0a561b92c08f2efc3899bc0636df6a8224ff83e8c
font_02_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 16216 bytes
SHA-256: d037df551f055afd1d5987f4d3e87812717f9b790abf4df51a968f84bd245f42

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