Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b1335c27fae3e5…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 02:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d10a4e5e72ac3685095991c46be1f3c4 SHA-1: 237b1ec11107a0dc6168d64300eec5dba1d739c5 SHA-256: c0b1335c27fae3e52dfdef10070405959d4fbf81f7dcb93106d3d05498706cf4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users to malicious content. The presence of these numerous external links suggests an attempt to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=2012+jeep+grand+cherokee+headlight+assembly+removal PDF link annotation
    • http://suzaxikuzexaw.66ghz.com/vejaxibobuwakuserapa.pdfIn PDF document text
    • http://nowtorrentz.com/84015569557cdnmc.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/kuwumulofetivumugimuruw.pdfIn PDF document text
    • http://zirirukefup.22web.org/78155126457.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/jiibheK/transference_in_psychodynamic_therapy.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hiLcDhe/house_party_tv_series.pdfIn PDF document text
    • http://normab-id.com/239014155349nb2z.pdfIn PDF document text
    • http://mugisawitunolaf.iblogger.org/craftsman_4200_watt_generator_parts.pdfIn PDF document text
    • http://reassurez-moi-fr.info/414112791918f49e.pdfIn PDF document text
    • http://shop-profildoors.ru/minidaxabiferiwnvzrs.pdfIn PDF document text
    • http://temezisabekazev.iblogger.org/circus_charlie_game_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nawinirezuj/ifibhhu/wheel_size_bike_for_5_2.pdfIn PDF document text
    • http://trokot-new.online/886908236694cf8h.pdfIn PDF document text
    • http://shop-profildoors.ru/girlboss_netflix_real_storyko907.pdfIn PDF document text
    • http://tekirivira.iblogger.org/vesedofudepiz.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/wupixufekijax/28551901429.pdfIn PDF document text
    • http://ralixafuligo.rf.gd/easy_formal_updos_for_long_hair.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/35876265885.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/microsoft_pamphlet_template_free.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/wezitidajumoxuzaf.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/didob.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/ringtones_for_android_mobile_phone.pdfIn PDF document text
    • http://xekujigifur.epizy.com/vusosudofozojafukapifi.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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 6160 bytes
SHA-256: e66146a0031e9adea539bbc8707742c65b2ca13ad5ce6c27f252e46c2a5c2631
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 10984 bytes
SHA-256: 7ef49b1175962ca07ce1c765e645815640353ebb6be7eaab3612ac1b6e1278b7

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