Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdbcfabf4dd4c56…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 16:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: de6f30c0c286085f45ebfb212af6a98f SHA-1: 2be7e341eb35efed0e97f4de3546705907cf35bc SHA-256: ffdbcfabf4dd4c569e0241f519d23b4e99e0924b8e47b395288e20930b37872e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery mechanism. The embedded URLs are likely used to host malicious content or redirect to phishing sites.

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://seumenha.ru/strik?utm_term=american+standard+furnace+error+code+4+flashes PDF link annotation
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/gojimuzi.pdfIn PDF document text
    • http://dozujudu.iblogger.org/vururitezisuwi.pdfIn PDF document text
    • http://kebawed.iblogger.org/android_emulator_for_pc_low_spec.pdfIn PDF document text
    • http://tederurokeroga.iblogger.org/kusozufidugubatezu.pdfIn PDF document text
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/a30661.pdfIn PDF document text
    • https://ketawisu.weebly.com/uploads/1/3/1/4/131454029/jazidekemafe-wivebenujuje.pdfIn PDF document text
    • https://vefajuvajodal.weebly.com/uploads/1/3/6/0/136094574/guwipositixuj-fumafilux-pupadunevi-jiwoxakewo.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/aap_se_milkar_mr_jatt.pdfIn PDF document text
    • http://nidolosa.iblogger.org/facebook_marketplace_com_login.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/b0e783b.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/7212230.pdfIn PDF document text
    • https://vurigejowuzebad.weebly.com/uploads/1/3/3/9/133997249/vodinifixu.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/fiwosegexakoti_tosixiboguj_xatefex.pdfIn PDF document text
    • https://lefelovavuj.weebly.com/uploads/1/3/4/6/134644752/jijimufowerow.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/natepulijizijibog.pdfIn PDF document text
    • https://megelegekirir.weebly.com/uploads/1/3/4/4/134464092/911766106d0ea.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
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_296f7b7134d94c4d90fead943787bc18.pdf?index=trueIn PDF document text
    • http://xokifenutotumu.epizy.com/wuzidiwezenarotigajazu.pdfIn PDF document text
    • http://bajaxugezozego.rf.gd/bismillah_in_arabic_calligraphy_text.pdfIn PDF document text
    • http://wuwezimuluf.rf.gd/24677686115.pdfIn PDF document text
    • http://sedukoxiwu.epizy.com/weather_report_camas_washington.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_4b6e4f57338e4ec5a2f3ca20190de8eb.pdf?index=trueIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_ffb6c60f39694ff59e8e40c5c060c221.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_8fa653572db5406f905da25621d7f4ac.pdf?index=trueIn PDF document text
    • http://debetofewozuri.epizy.com/kutavezumomal.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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 5220 bytes
SHA-256: c3138040659f4ec41bded878f4159120745b4e4d1a220e41fabeff4b1ab012b1
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10128 bytes
SHA-256: 48ca6df82da8c2bc367ab740d218ea93689530aaf91b55714f51a4406c43474a
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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