Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b562b45967fdd29…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 23:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2daf0216849608370647c26434d0f49 SHA-1: d64c1e8d50299143f07aef9d0a96a3a7be8b3aed SHA-256: 5b562b45967fdd29fd0a43035056a7fac9747236acbc413b70132a6a22f18926
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or SEO spam campaign. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=arterial+line+whip+waveform
    • https://cdn.sqhk.co/vilitemeru/fgdijVV/92268996421.pdf
    • https://cdn.sqhk.co/ripowusaro/jaURgcQ/55426725761.pdf
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/rudebapimaluxuxumo.pdf
    • https://cdn.sqhk.co/sozasusu/caiegjq/pottery_wheel_kit_for_adults.pdf
    • https://cdn.sqhk.co/sixepatexup/fh8hhji/xotifujoredarudebikuvites.pdf
    • https://cdn.sqhk.co/mekibekowufe/WT9hgwo/46499012993.pdf
    • https://cdn.sqhk.co/wozulifudon/HiihcVC/56921618566.pdf
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/komidigoxoresa_sitatower_dozododekol.pdf
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/6545524.pdf
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/vimirilasen_xuwupa_nizim.pdf
    • http://fumigatoff.online/929351633884v7ir.pdf
    • https://cdn.sqhk.co/nowovadizeb/Yjiljh3/ants_simulator_oyy_meaning.pdf
    • https://cdn.sqhk.co/fajaleniwa/CjiTMgg/malaysia_2019_monthly_calendar_template_excel.pdf
    • https://cdn.sqhk.co/jesotipo/hcfiaRf/saturday_weather_liverpool_ny.pdf
    • http://minuette.me/why_is_my_frigidaire_portable_ice_maker_not_workinggqcl8.pdf
    • https://cdn.sqhk.co/modajili/2fgghfn/40144505964.pdf
    • https://sikegupul.weebly.com/uploads/1/3/4/6/134681682/6755705.pdf
    • http://universityru.fun/sony_dream_machine_auto_time_set_manualkg6qs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tokatefozude/gamexitaxififar.pdf
    • https://s3.amazonaws.com/fosalizuzu/miller_millermatic_211_mig_welder_package_with_spool_gun.pdf
    • https://s3.amazonaws.com/fizaxo/rigirumesufofuwika.pdf
    • https://s3.amazonaws.com/kosamupim/54071609704.pdf
    • https://s3.amazonaws.com/jemisajoda/48612050097.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cbf.bin
a27381006b78946bdc1cba5f3f9cbefcf5a22aa48f172ef4649b65344e28ac8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 5104 bytes
font_01_sfnt_off00011e08.bin
31c5e81cabd1d58208612db412bf63eb37b79a92818fddca4bec533634600688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 10708 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.