Malicious PDF — malware analysis report

Static analysis result for SHA-256 27273a5c0b13f447…

MALICIOUS

PDF

81.8 KB Created: 2021-04-06 00:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c82077ee9680a255d69d20316abefcde SHA-1: 24f98f3cd2b35b48739c81d0e6a839b6db147184 SHA-256: 27273a5c0b13f447bc479913beaa986a7d0bfd7656edf09ac50d373008eb31ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, with one notable URI being https://leonvi.ru/award?keyword=behavioral+activation+cbt+pdf. The PDF's structure and the presence of many links suggest it is designed to lure users to potentially malicious websites, possibly for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=behavioral+activation+cbt+pdf PDF link annotation
    • http://instapriz24.site/organizational_structure_powerpoint_template97asz.pdfIn PDF document text
    • http://gamedv.design/mamiya_rz67_lenses_listdarfq.pdfIn PDF document text
    • http://erogan-encolumbia.site/48283497513ngfiw.pdfIn PDF document text
    • http://dkmz2.club/keratin_hair_straightener_without_formaldehydennopn.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/church_of_christ_sunday_school_lessonst34bl.pdfIn PDF document text
    • http://datinge.site/92390678737aqhtw.pdfIn PDF document text
    • http://mijudivoxobo.iblogger.org/93451651014.pdfIn PDF document text
    • https://tuxedibuzi.weebly.com/uploads/1/3/5/3/135350702/raxak-fulof-gekaxojo.pdfIn PDF document text
    • http://ejinaya.com/852589003498v71k.pdfIn PDF document text
    • https://xemuvexakono.weebly.com/uploads/1/3/4/6/134655393/0eb138553141a26.pdfIn PDF document text
    • http://thelandofbadideas.com/western_digital_my_cloud_app_for_windows_10b62ef.pdfIn PDF document text
    • http://zekoselu.22web.org/warezafixegikipomavu.pdfIn PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/virizotu.pdfIn PDF document text
    • http://reduslim-officialsite.site/earth_treks_membership_rateslcsw6.pdfIn PDF document text
    • http://mexuzekinukogip.iblogger.org/dog_breed_quiz_questions_and_answers.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/lixuzo/gefubenoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43092d56-f148-4e5d-b7b5-14199f7ad3fe/kubezamazimeveza.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/dadedevope.pdfIn PDF document text
    • http://netozovozuze.rf.gd/star_spangled_banner_piano_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7049b3-fef2-45b2-b70a-70743cff48e4/86090263496.pdfIn PDF document text
    • http://nixevafuzija.epizy.com/zubopipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3547efcf-5140-44e4-ac4a-7636bd2a83db/ravpower_wireless_charger_stand_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/96812601033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4760782-2c04-4712-8f42-cad9591f824c/practice_sat_essay_examples.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_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 5316 bytes
SHA-256: 102da7127299c5dcec9cf86246032c8a692e376de158a0f2d8f9102fd2538143
font_01_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 11040 bytes
SHA-256: fbecaf4683ad4b07fc4b1924d9a589fe9a3a8f0d74e65c47824d2d26dbc9210c