Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca0cf800ed0b02…

MALICIOUS

PDF

106.5 KB Created: 2021-02-10 18:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9755df8d91132c1ac655f2260f0a3293 SHA-1: b1d1e368fb87cb443f01857418de26876f145d4b SHA-256: a9ca0cf800ed0b026ab8b0abf9cb16ff3cfdd826a6c2b9355ccd668d77265305
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable. This technique is often used for SEO manipulation or to distribute further malicious content. The presence of many external links and the ML classification strongly suggest a malicious purpose, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/aws?utm_term=gas+chromatography+mass+spectrometry+principle+pdf PDF link annotation
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/5450429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386621/normal_5ff20e16de79e.pdfIn PDF document text
    • https://terifebi.weebly.com/uploads/1/3/2/8/132815785/8832552.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/dfd332037f.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/adca7409e.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/raboribexaj-dumitebimuti-jitiwu-kokaj.pdfIn PDF document text
    • http://creditreportfast.info/fejaxaxalokezizuwepl24s.pdfIn PDF document text
    • http://taptopbot.com/printable_self_certification_form_nhsjtmmr.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/3648093.pdfIn PDF document text
    • http://blaugrana.ru/hori_rwa_racing_wheel_apex_manualsrdzp.pdfIn PDF document text
    • http://the-job.ru/auto_electrical_wiring_diagram_manuamj2zw.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/ladasoz_pozuwat.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/furozunudomije.pdfIn PDF document text
    • https://kusagurapatavo.weebly.com/uploads/1/3/1/8/131871515/gumaxixizeniseka.pdfIn PDF document text
    • https://novifutifodex.weebly.com/uploads/1/3/1/6/131606636/583fe222.pdfIn PDF document text
    • https://gapuromediwav.weebly.com/uploads/1/3/0/8/130814643/853099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479451/normal_5fdc3ec6185b5.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/682531.pdfIn PDF document text
    • http://uscreditcheck.info/55055494568e8rjw.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/9506372.pdfIn PDF document text
    • https://pekixutub.weebly.com/uploads/1/3/1/4/131453658/5307456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA8 5492 bytes
SHA-256: 454501328c73f73d4b13c58c540d521b245aa5db1c77d35314adaf4d23fb9e49
font_01_sfnt_off0001513c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513C 11940 bytes
SHA-256: bd7ea94a2954902b03252eff255dbb9eed58e514683c07c78b10769813272bce
font_02_sfnt_off000178c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C1 16028 bytes
SHA-256: 8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f
font_03_sfnt_off00018d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D09 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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