Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb16c6b232d4679…

MALICIOUS

PDF

87.2 KB Created: 2021-02-15 23:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 94313a882f8f2ec0b81a2608d9812390 SHA-1: a0f94f090ae02a74b8121193377278246fc2aad6 SHA-256: 7fb16c6b232d46794ea62fd54ffedc67471ab4bc639cdab5e09058af1f073485
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=graphic+design+portfolio+template+psd In PDF document text
    • https://cdn.sqhk.co/daxonotetil/ZsAIf9a/75292355450.pdfIn PDF document text
    • http://viwaginuf.iblogger.org/61580318466.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/YWol3BA/alive_in_shelter_mod_apk_android_1.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/2355230.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/terraria_armor_set_guide.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/22296413817.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/Aggmgda/lanawune.pdfIn PDF document text
    • https://lirikilufowu.weebly.com/uploads/1/3/1/0/131070293/fiduvasimotasu-todarolumerosu.pdfIn PDF document text
    • http://lovunusugi.22web.org/wutesasawujukamositumoro.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/bCih3JP/leadership_skills_and_qualities_of_bill_gates.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/ieihgcW/lebemowoseduk.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/f926c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwofitobuz.rf.gd/l2r_your_guide.pdfIn PDF document text
    • http://pazizota.rf.gd/hitman_2016_tweak_guide.pdfIn PDF document text
    • http://xivegujox.epizy.com/portland_rmls_report.pdfIn PDF document text
    • http://kekokid.epizy.com/bifugufunusinowugoramomi.pdfIn PDF document text
    • http://zosofoladi.rf.gd/benerafetidozizidukififog.pdfIn PDF document text
    • http://zezevefo.rf.gd/83886656634.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/nosizasifiwapokufula.pdfIn PDF document text
    • http://kutoduno.rf.gd/xujifosovifu.pdfIn PDF document text
    • http://vasozebuxez.rf.gd/rifokijanoluwonodiwubu.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_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 5600 bytes
SHA-256: e09cc102f2c26bdf60e804f2764527964bfbf034eeca1d38f584e02e89b18325
font_01_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 10632 bytes
SHA-256: 79dbcfc3ee74b1aa74299ec03572388f122b8e937ce3fd9e78d338b3b60c160a