Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb16d6dea1a0950…

MALICIOUS

PDF

126.7 KB Created: 2021-03-24 17:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 55b69f284df7011d2d18580a2cc9f1d0 SHA-1: 1352a22ea992180890bb61c0f2e9a4d904a9eea2 SHA-256: 9fb16d6dea1a09506dae552dc189ba2a2b92c43f598eb07fe71bb66979f1cfff
186 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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/wix?keyword=hunting+the+elements+video+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391903/normal_6037940f183c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6039c42c50d39.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/marvelous_inc_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_6038c9ef3e439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_602169a14ffed.pdfIn PDF document text
    • http://volanorirabu.22web.org/catholic_introduction_to_the_bible.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_b4e23aca529347568ec2f10aab881416.pdf?index=trueIn PDF document text
    • http://tipakofixu.epizy.com/oneplus_android_10_gestures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47db9d7c-a9b7-483d-bd60-5a6950eae794/50593594039.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_7f9f38b5dbf94795a78f89c2c5a2c24d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad0bf98-589c-43c0-94db-9044e54e3a2b/6938820173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c581f9c-98b5-4b56-a9b7-cf220b370b0b/how_many_hours_to_study_for_dental_school.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_fc5a36b1dbab4291a41cf2daef91b937.pdf?index=trueIn PDF document text
    • http://fawamoru.rf.gd/92258699299.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/74158338558.pdfIn PDF document text
    • http://mulusatore.rf.gd/massey_ferguson_35_manual_free_download.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_off0001b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B51A 5416 bytes
SHA-256: 830f00c0c42b918f7439fade7c4f1d12e0fc803601361ae208676c2e757785f2
font_01_sfnt_off0001c76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C76C 10980 bytes
SHA-256: 9a0cf709386d46ede0c420f11ee591a2c3df222d06da1f751a7dc4a6ab85c611

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