Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81c660a71bf54f0…

MALICIOUS

PDF

74.9 KB Created: 2021-02-18 01:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 33a0478ba2386f6fc447969e547735fd SHA-1: 82cbd11ee522da81b25554e256e1b27c677bbf28 SHA-256: d81c660a71bf54f00c4930553b0b6d4b78d8bc1df78dec8a5312fed00b36544c
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a URL pointing to 'maypoin.ru' with a keyword related to an APK download further indicates a distribution or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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=tic+tac+toe+pro+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5ff4619a71f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_600adb8f7661e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_5fdafe5de36c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fd2708ea059a.pdfIn PDF document text
    • http://boomua.site/fluke_435_power_quality_analyzer_data_sheet2lwqv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fdc71d5ad9d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_60120ca33d465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_600f9a5850fb3.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/9de8ba4caa65.pdfIn PDF document text
    • http://rowajenuw.iblogger.org/90373855447.pdfIn PDF document text
    • http://texno3ua.com/nezadokikorewir09pl2.pdfIn PDF document text
    • http://thechambre.xyz/tedonohupyl.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/wixatax/mobile_food_truck_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/wevazajexobapugifagidurik.pdfIn PDF document text
    • http://mamisiz.rf.gd/atletico_madrid_juve_formazione.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/ajax_call_django_template.pdfIn PDF document text
    • http://woxesuguve.epizy.com/23870217653.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/kotiweseparudisopotowiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 4728 bytes
SHA-256: 035c3037ed3099eff599dd84e661ddaf96ec6982ad30f5688645122fb024c8b7
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 2268 bytes
SHA-256: a7b50af3007404cd484ea18b859675363d9259426f5273a3dc9f36bf533a0a2a
font_02_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10488 bytes
SHA-256: 74f3e16897226ae4ae88b14ce95c636d08912addae752588bd35bd478f4c5f73

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