Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f4e88f889a4ea2…

MALICIOUS

PDF

122.7 KB Created: 2021-02-17 11:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 243c8642d2ea9be8a6c79bbb753e55ec SHA-1: 5d4b113248074c8d8afa1295e4da74db637ce6a4 SHA-256: f0f4e88f889a4ea24283cc9eb36ca0a7f0c761d56f5ed180c2eaa1c430955a4d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and the nature of the link farm heuristic strongly indicate an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=casio+ga+1000+adjust+time PDF link annotation
    • http://bigonetudukori.iblogger.org/jodupobi.pdfIn PDF document text
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/rapewenejinuw.pdfIn PDF document text
    • http://markettop.pro/fuwojamoxunur.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/lopumewit.pdfIn PDF document text
    • https://xuvesebitewetok.weebly.com/uploads/1/3/6/0/136086761/zupikubitejikaw-mebug-tewevud.pdfIn PDF document text
    • http://freshka.fun/antioxidant_enzymesxdpes.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/1346caabe5954.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/96a0a4e426a8.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/lusada-porajekak.pdfIn PDF document text
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/paror.pdfIn PDF document text
    • http://homearfes.com/20969131356brb5r.pdfIn PDF document text
    • https://rokumipizo.weebly.com/uploads/1/3/0/7/130776068/pixezixifub.pdfIn PDF document text
    • http://dfds.in/tofitemij9tbe.pdfIn PDF document text
    • http://50offstore.pro/587625693629gsa8.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/tupofelasujewas/84250958967.pdfIn PDF document text
    • http://pevinojemodil.rf.gd/dads_worksheets_subtraction.pdfIn PDF document text
    • http://fibotemirazopo.rf.gd/ad_hoc_networks_in_mobile_computing.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/97579139523.pdfIn PDF document text
    • http://debefataxa.rf.gd/kiddies_academy_beaconsfield_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/57052160910.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB3 5192 bytes
SHA-256: 0b110b4fbf9389f82728931702471e5a93db9be228d28c36b8a1c11b4e9da899
font_01_sfnt_off00019e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E51 11872 bytes
SHA-256: abb90a29dc2a78d4436229d01f3cd6b404628f7dc2fdb761be94fab9ad733db1
font_02_sfnt_off0001c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6EB 16296 bytes
SHA-256: 1eb2d602a8f0fbd29cf35e28249ef192f748b5a163674ba4d9c287d47c1a48c9

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