Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8a84dedb2e293d…

MALICIOUS

PDF

78.3 KB Created: 2021-02-19 12:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 640c6835a89514a4346a27012afe781c SHA-1: 3ccdec0a758f125689bf6ec95bf5fb1def82ea90 SHA-256: 1b8a84dedb2e293d3e3bcc3deb9f0cfb0081ce7e3f00b24e1e0331a8964d5d26
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests a lure to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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/123?utm_term=what+is+a+class+a+military+uniform In PDF document text
    • http://lopekojupapo.22web.org/3171207146.pdfIn PDF document text
    • http://pavaverijakat.iblogger.org/cambridge_igcse_mathematics_hodder_education_answers.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/270a1fcd3c9be92.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/pifodoxepavowipulon.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/84f2f3c9cb49b2e.pdfIn PDF document text
    • http://medyayazilimtr.com/lavulabakakeritavazunuwlxao.pdfIn PDF document text
    • http://marketitaly.info/cetoacidosis_diabetica_ada_20189xw2a.pdfIn PDF document text
    • http://o-karte-kopilka.com/97775812894pcb07.pdfIn PDF document text
    • http://lnstagram-office.com/nifuvutapekixor6pgk9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ffdc68d35700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497071/normal_5fff7c333c1cd.pdfIn PDF document text
    • http://pavezala.iblogger.org/vokufagewubukozuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5fc7a8d123b54.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/xefejevife/jeevan_lakshya_premium_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/96565446372.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/kinematics_problems_worksheet_with_answers_doc.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/habibi_english_arabic_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/baghban_video_songs_tinyjuke.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/bluestacks_for_pc_window_7.pdfIn PDF document text
    • http://repikigerudu.rf.gd/what_is_self_efficacy_means.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/ruvob.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/zubudozilenofeb.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/ambari_kannada_picture.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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 5236 bytes
SHA-256: cb71b59e9091cc12a144b3fd0ed83f3499b38cd9df03bee9862f20200866a2e1
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10308 bytes
SHA-256: 1077ecb28bd8931515b063c611b46b74ba9175ebceb26b2a04fb394390693537
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 6084 bytes
SHA-256: 0c3766dce408445f50e904d652c9326647873efe4fb22fffa238fb744f3c79a9

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