Malicious PDF — malware analysis report

Static analysis result for SHA-256 5626811566e5eff6…

MALICIOUS

PDF

69.0 KB Created: 2021-03-01 14:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b6c966057804c9a1b02a03b23010d3c5 SHA-1: fb3b60b0b97e0a1d16e9a0dd61b69f5e637c3d49 SHA-256: 5626811566e5eff6f604f83f66511a75ecc2b58f5d856117f843bcc76e172c54
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting a SEO spam or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to an assembly manual, directing users to external URLs like https://resalured.ru/wix?keyword=big+green+egg+assembly+manual.

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://resalured.ru/wix?keyword=big+green+egg+assembly+manual PDF link annotation
    • https://cdn.sqhk.co/remigalakefo/iakkjgt/5583084687.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/vqgcifI/59253643418.pdfIn PDF document text
    • http://nicepics.xyz/linksys_wrt1900ac_router_reviews8hvrc.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/phjjcii/ark_survival_evolved_pc_cheats.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/1897593.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/oMAjb6Y/92064984384.pdfIn PDF document text
    • https://benikadavax.weebly.com/uploads/1/3/5/9/135964790/waferutamik_busujove_kijef_favusebuba.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/be2c82937b7.pdfIn PDF document text
    • https://robigatif.weebly.com/uploads/1/3/0/8/130873787/8434904.pdfIn PDF document text
    • https://cdn.sqhk.co/topefebi/ixbhc6A/nufatel.pdfIn PDF document text
    • http://itanah.space/66893568481wf5rn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_6033871cd26c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzosuvupe.rf.gd/buzogixodujewogipikiz.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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 5296 bytes
SHA-256: 0813363ad5cd17243813b4cb5625faa0671d23e8050f84c50f921edf940e6c34
font_01_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 10116 bytes
SHA-256: b2bac6ef822e91d6132d0d8f7fdc4e1f76ffb28a2c8eae08de3c157e37677b70

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