Malicious PDF — malware analysis report

Static analysis result for SHA-256 530dfa1ec0b5af8b…

MALICIOUS

PDF

88.0 KB Created: 2021-03-23 20:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 66f5fc86cf9f6a5b3b1e27d160d52e0c SHA-1: 5ac465b7628e394d8389dd8d70d1f73bf22391f9 SHA-256: 530dfa1ec0b5af8ba0b6b0e9a851cbdaf5fd87b15d403e90faed6a5d13a716c5
186 Risk Score

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://jacksth.ru/aws?utm_term=critical+thinking+test+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fe8eab85ec76.pdfIn PDF document text
    • http://zebarugusi.22web.org/new_yorker_radio_hour_live_stream.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/vuwadutal.pdfIn PDF document text
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/kusalozevezep.pdfIn PDF document text
    • http://velixone.66ghz.com/vixofuroxaduz.pdfIn PDF document text
    • https://jepusorowuw.weebly.com/uploads/1/3/4/3/134370943/4478de9c7.pdfIn PDF document text
    • http://xuziduliwilu.iblogger.org/48820844591.pdfIn PDF document text
    • http://wigewanadowo.22web.org/calendario_laboral_2019_espaa.pdfIn PDF document text
    • https://pidolanapeg.weebly.com/uploads/1/3/0/8/130813957/3927237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcdc88e6525d.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/divelatoxa/vavuvisazizekuf.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_5829e1e240a448b683fd2837f9ffd1a5.pdf?index=trueIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_fb63d4b66dd14c04b69d4071d84e28f7.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_dd6f192420fa4b2aa221c8fe0511f8d6.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_52c13e1dd6d847a1ac763f91e5290322.pdf?index=trueIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_3c941cda97ce4b2eb9a75e613eb9cb2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/final_fantasy_xiii_official_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/second_variety_characters.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_7b491eb2870946d685b2323ad6e51746.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_3dcf19ab255f4084bf598403da48e6d8.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_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 5604 bytes
SHA-256: 9df2ffd791ff27797a5e1f10504f98995239f6d2f678744f035a23db415e0e6e
font_01_sfnt_off00012baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 11500 bytes
SHA-256: 1386531a2b64a08ddbceceef66678a01d4a85d3a2cba3bb1847d9c059e5564c8