Malicious PDF — malware analysis report

Static analysis result for SHA-256 24395656fcce9033…

MALICIOUS

PDF

85.6 KB Created: 2021-04-19 10:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 09141eb40ff5a640a10e43f2ee3489a2 SHA-1: 225ac6c24d5cc15db7ecf1c79ebd3686e4cbb6e9 SHA-256: 24395656fcce9033a39a9db9e26bd67c859b48e1385559f2ac30107ab180c8a2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://maypoin.ru/strik?utm_term=why+is+my+hp+deskjet+2600+not+printing' is presented as a search result for a common printer issue, a common lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://maypoin.ru/strik?utm_term=why+is+my+hp+deskjet+2600+not+printing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407562/normal_60674bd32040c.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/9P8gfga/84740848262.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/dhdifMn/zunofufizi.pdfIn PDF document text
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/9295832.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/dewapilemusepunagut.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/G2ialvp/elunevision_aurora_review.pdfIn PDF document text
    • https://papozigej.weebly.com/uploads/1/3/1/8/131858530/deba95a127ad.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/xomab.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/tobiwuz_kutetazalunol_fevokejixeni_koliwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_6059a02c20e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_603a8cf8b3e5f.pdfIn PDF document text
    • https://cdn.sqhk.co/raluzafa/ggfSiaO/deferred_compensation_tax_reporting.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/xekovegazekezox.pdfIn PDF document text
    • http://lufusozajufa.22web.org/wapodolumavugufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_6003bd9ebbcbb.pdfIn PDF document text
    • https://vuxosulaleko.weebly.com/uploads/1/3/2/6/132695375/faeaa3e8f85ba6e.pdfIn PDF document text
    • https://bukudemedu.weebly.com/uploads/1/3/1/4/131483547/tanozeranuzix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_60374103c6e58.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/2067716.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/b2a4899266ac9.pdfIn PDF document text
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/6584218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulewuf.rf.gd/aadhar_card_by_name_without_otp.pdfIn PDF document text
    • http://pitikepaz.epizy.com/simplifying_fractions_worksheet_for_5th_grade.pdfIn PDF document text
    • http://duxuramubot.epizy.com/16046416101.pdfIn PDF document text
    • http://wafidifu.rf.gd/38167773465.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 6416 bytes
SHA-256: a497fc52ef216d2369a1cda088bdeb49e1b2edea4e2999984a7939df6a238a3e
font_01_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 5812 bytes
SHA-256: e7945ee0956d77d60c6f017ef5d0d906623a8f407ef924825ddba7c9a97574af
font_02_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 10852 bytes
SHA-256: 16b04a5ed9b61cceb3d3abdecf9485bd1fcb2213af9593c476531a537e6f9e20