Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d3a8e2074abc51…

MALICIOUS

PDF

75.1 KB Created: 2021-03-22 17:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3b1a613a12bdb0091be5ee8b2f1d878a SHA-1: 56d73fdc698ab74bf6eb61bf40260f3af0c5b3ce SHA-256: c6d3a8e2074abc5114717aefe010db9adbeb144f35d7c2d42455e5e6e7369915
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 0.9998

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://mezovuduw.ru/wix?keyword=black+and+decker+microwave+oven+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491432/normal_6050d2d4f022e.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/Phajh8H/hair_braiding_in_las_vegas_nv.pdfIn PDF document text
    • https://besusawoses.weebly.com/uploads/1/3/5/3/135318815/woxosawas-lajot-zozale.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/lafiduwaturakijoseg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fccba7602fb4.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/SQTXDFl/43871915441.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/fepelilojoluge.pdfIn PDF document text
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/kuviwikavul-watenifinur-lokesunogupepov-wevap.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/823e43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/dijepovipoxubanuxorefene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97875356-e36c-4661-9805-1a1ac64362c4/p90x_plus_workout_schedule.pdfIn PDF document text
    • http://xujided.onlinewebshop.net/86340255121.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/naviwojinejesuwatuxajurav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0be8d7c-ba97-478d-bce8-d3554a2a1e92/bose_acoustimass_10_series_iii_speaker_cables.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/english_grammar_worksheets_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3a8aae-aea9-4691-a5bc-7c9f15dfcd79/71429029432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467d2b36-c5df-4bdd-afdd-1020931ff7d9/wogamiziti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ed2781-0ce8-4f06-98fc-2e81d01126a5/asus_z97-a_m.2_pcie.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/25430138425.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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5172 bytes
SHA-256: 5268052eb0505f66cb8d80091ecd1d9366aa679e684513f8a0dcb45f5255b4f6
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 11088 bytes
SHA-256: 8f11adcf6e76c15c5df21e54e3befc22146ef8bd1a101976cc06953402093e33

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