Malicious PDF — malware analysis report

Static analysis result for SHA-256 149646d1d321af68…

MALICIOUS

PDF

94.2 KB Created: 2021-03-19 16:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01bf68469a2d856c110cc48cacb97e09 SHA-1: 4502e6dd54e7b7f7f9c7d42c1d82268e5341273b SHA-256: 149646d1d321af6892204b6e13b8d972296b49435b2f89a69b0be62363807c15
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

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://jottigo.ru/aws?utm_term=ethics+book+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481518/normal_60077073ef361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_6023d97054b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_60443ee75b848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_601835be7cf11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_852217f9625f42fc84c2ab281c0c29f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ec9933-745c-45c0-930b-758c25c9d476/what_does_the_tip_of_the_iceberg_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e28ec8d-e8f1-4ff3-ac25-7a596b17daf6/vivenopuxevix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cdb7ea0-bc57-4091-9f3c-619cfda58428/82245267833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ea01fe-cc76-40e4-bc27-38ca3eb4717c/is_the_elgato_wave_3_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/archicad_18_tutorial_free.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_993b20060d394fa88b9ff0c7d2c5adb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/dugimuwufamulafife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41634efa-3e12-494b-80bf-1c89105ea18c/billye_brim_the_authority_of_the_believer_and_how_to_use_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea15740-4c89-4e27-82ac-e79ce0f04876/are_smart_scales_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/xavunazed.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_e94b7eb33556437c987a8e04811755c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5149e6-fbb0-4068-b780-60b6e4ef20d4/643372843.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_43066e4e8fa34e5e959f0646181e5776.pdf?index=trueIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_0092cea1efdf456a8730f5c38ae013bb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 5400 bytes
SHA-256: d9f455df468daf475183fbf5f3ec56ea62074a0d012a4ee57aa29e12659a674c
font_01_sfnt_off00014770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14770 10672 bytes
SHA-256: 15452628982a6d8079bb821491996f3447f2219216c5732a99eb0b56a2d83118