Malicious PDF — malware analysis report

Static analysis result for SHA-256 db787f88c57955ea…

MALICIOUS

PDF

77.2 KB Created: 2021-03-21 10:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8c4fbee3f3044366f421bff560130640 SHA-1: c5d949508481aaf28e732b6acf1707de64112ee2 SHA-256: db787f88c57955eafe97cdb099eb5ec0b27287c03bf97ee98c47a5298e9e3f64
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or phishing. One prominent URL, https://maypoin.ru/wix?keyword=amscope+sm-4tz-144a+uk, is directly embedded, likely serving as a lure. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=amscope+sm-4tz-144a+uk PDF link annotation
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/5e2851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fe55cf3c7a5b.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/jagomolizobomojukizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_600e77e7426cf.pdfIn PDF document text
    • http://lutefadeba.scienceontheweb.net/amplitude_modulation_examples.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/giwokejataf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_600673672151d.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/sivigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/timex_expedition_scout_36mm_mid-size.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_ee5234b787214ca49b87ac332f3dd92e.pdf?index=trueIn PDF document text
    • http://renaxodemebi.rf.gd/noxipuzeroxag.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_47e9cdea0f494edd912433017a17981a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/secure_vpn_for_android_2.pdfIn PDF document text
    • http://kilubediboxut.rf.gd/robotica_arduino.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_ecae4964039d42d6bf5028f243e13743.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/4727810390.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_389017b69d8a46249ff40410965f3aa1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/free_math_worksheets_dividing_decimals.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/java_concurrency_interview_questions_and_answers.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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 5228 bytes
SHA-256: 1a4946ed1b0c997a7132e474e5b4a0668d368ff4cf2b0a4fc02b70792c0df161
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 10432 bytes
SHA-256: a22d2c170613134156cda2f5ea552dc49bd502c51ef13b2026d0672be266e3ed

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