Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5638977998c1516…

MALICIOUS

PDF

73.0 KB Created: 2020-12-10 06:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d079d2da1e239f4ddff0e6fde145eeb4 SHA-1: 95e602b083d0801aa54bf7b82a8fac9f5e34a272 SHA-256: f5638977998c151624f8a6fea61e83b8f4d60dfbc9365c7f4b0fe276eecbfe41
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://trafficel.ru/aws?utm_term=application+format+for+school+leave+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f953366c017b.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/3070373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f87d08127555.pdfIn PDF document text
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/xivonor-moxejoromodujuj-xudojaxev-jigiruzipisag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7a0ccd743eb43444a4edf/t/5fd08a6689fd2c07d10564b9/1607502441528/etisalat_business_center_dubai_timings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f348b1-6dc1-49a2-9ddb-f0f92f05a155/6581616373.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11c6aec917750a3d920aa/t/5fc2f542173fb5383b053fd8/1606612290508/heavy_duty_duffle_bag_nz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec955687f52b6b8145c1/t/5fc3cf131972c46e3c12929e/1606668051651/diy_wedding_reception_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/cardiac_heart_failure_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ea86dd-abe5-4982-a570-735d125b9723/bissell_3_in_1_steam_mop.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/kagesiwixowigamoxep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e31917e7202640ea1cd4/t/5fce8e22c2b3c55846dfcb5b/1607372323174/xokezadezofafase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a5221b-2797-4758-95f9-5de3276ee7b9/slither.io_mod_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f73d1c8c741314321d77/t/5fc5e3e89b1ed03538a98edf/1606804458722/34673562052.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5824 bytes
SHA-256: a74489a1f76b3b6b944bc860f9e124b35bdd433c875040efddb6e2979ed603bc
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10740 bytes
SHA-256: 30bd1d93af1adcf15d449ca224498c089adf33f7798b6bb7c7ba9afb40957d72

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