Malicious PDF — malware analysis report

Static analysis result for SHA-256 af15843280b74ffb…

MALICIOUS

PDF

70.2 KB Created: 2021-02-24 03:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6f0e13b08623f5f9ea8cc72f7195d66b SHA-1: d2926e0a102b747c1036144a733dac3298c5d135 SHA-256: af15843280b74ffb6f166648417594e961bb811b96768fb3563ced4520c00de9
126 Risk Score

Malware Insights

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

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 0.9998

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://jottigo.ru/strik?utm_term=tipos+de+investigacion+cualitativa+y+cuantitativa+pdf PDF link annotation
    • http://topcreditcheck.info/what_is_stranger_in_a_strange_land_aboutxiwgq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5feb67d3735db.pdfIn PDF document text
    • http://lightly.store/bjarne_stroustrup_c_programming_languagev17mr.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/a0444.pdfIn PDF document text
    • http://it50disconto.info/9100238569538mpd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fd28b045ab4d.pdfIn PDF document text
    • https://moxamegok.weebly.com/uploads/1/3/3/9/133999551/15b33ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5ff502201cfff.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/telojexabi-tusivodi.pdfIn PDF document text
    • http://kulinar2020.site/fixidonogzj01g.pdfIn PDF document text
    • http://lowazaz.22web.org/fogosidezinibenimorarab.pdfIn PDF document text
    • http://badgesverified.com/gamarusenolopavug5rfqs.pdfIn PDF document text
    • http://serviceforyou.site/541863496805tj4n.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/786a2cf3f.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/zatazewoz/afsana_khan_all_song.pdfIn PDF document text
    • http://wesufonezis.epizy.com/bhutan_telecom_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/98651083035.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/92281737451.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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 5340 bytes
SHA-256: 6319d77ee669196c36eb18f1345242cbbb7a68b963a726d99ebe5a3e9a6a9d0a
font_01_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 11496 bytes
SHA-256: 58460cf5589b88b9a729da9f7e26d3e0f11ffe8557729932d63c755db9e7d150