Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0613e0998bf6e31…

MALICIOUS

PDF

134.2 KB Created: 2021-03-28 18:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 705ced31bcfaa69279496b4ab9b8511f SHA-1: 5aa657ccd93e52d161a6b0aae8d16f9d3c98d711 SHA-256: a0613e0998bf6e3144657b1a5035e8d35b15c2896f7e963d8a2f185ec5b414fd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/wix?keyword=abnormal+psychology+in+a+changing+world+pdf+free PDF link annotation
    • https://cdn.sqhk.co/labojime/heqjeie/lenovo_ideapad_l340_laptop.pdfIn PDF document text
    • https://naferukogewoza.weebly.com/uploads/1/3/1/4/131406713/tumirunapimumuxuvaji.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/hjjichb/savemumilunuv.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/fKM0EwB/xefodoxomawesokozime.pdfIn PDF document text
    • https://xaweregosakub.weebly.com/uploads/1/3/1/4/131407668/ramexiziz.pdfIn PDF document text
    • https://gadofipod.weebly.com/uploads/1/3/6/0/136056298/1894011.pdfIn PDF document text
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/1384006.pdfIn PDF document text
    • https://jupiretuvivu.weebly.com/uploads/1/3/5/3/135383394/jogukomukisupe.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/hfz0hiO/saint_seiya_ps4_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/ehcigib/gamefly_customer_service_hours.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/c0d7a9d5.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/nifuseputaw.pdfIn PDF document text
    • https://jolumipeba.weebly.com/uploads/1/3/4/7/134766715/6783329.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/lakafilurufoji_takifuzavakirax_kared_jonorat.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/BhcEjbH/racing_wheels_for_sale_ps4.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/4898334.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/rokidaninagu_nifuruja_sorirolaxe_jixevonexi.pdfIn PDF document text
    • https://cdn.sqhk.co/xisapabo/jhhGKYp/deviation_investigation_report_template.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/julaxel/pekoketevema.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/nouns_worksheet_year_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/89571079421.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/brief_calculus_and_its_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/aspera_connect_firefox_plugin.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_off0001d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D190 5892 bytes
SHA-256: a3991baf159b0e6425f6902c52c5567124273d1b1201289618ac3a90d04a549c
font_01_sfnt_off0001e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E580 11260 bytes
SHA-256: 93452202199209443314c2d4ba5771e81909028f6293f5b8fe4c967c6cfcc9d3