Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf26d6fc716fed4…

MALICIOUS

PDF

73.9 KB Created: 2021-01-17 20:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0a3461666c57093c16cdca8fdd19173a SHA-1: 7d31eb4fde623de651621c71d3699d79a21c216c SHA-256: 3bf26d6fc716fed43e61dbb9788d618ef6d3800e9cf2e771240f31ec1cfd64e5
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/123?utm_term=escoffier+le+guide+culinaire+revised+%25282011%2529 PDF link annotation
    • http://kufigada.22web.org/earth_science_worksheet_new_york_state_map.pdfIn PDF document text
    • https://site-1176273.mozfiles.com/files/1176273/18996090720.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/f8f818e285.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/jamekapuri.pdfIn PDF document text
    • https://site-1175602.mozfiles.com/files/1175602/lego_viking_voyager_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_5fc16778f2587.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/vubajolijola-dazokoji-tilev-fuzatiremovofil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5fe67386196cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fbc88c32ac68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f969f4853297.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/zapevakujoxapupal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixuxopot.epizy.com/bkav_home_full_crack.pdfIn PDF document text
    • http://dogamesesokuj.rf.gd/best_alarm_clock_app_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/android_studio_install_ubuntu_16._04.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/linejijopivoxalugolosu.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/rexazofaxunolufubo.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/free_pioneer_owners_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/sililikoxibaser.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/casio_watch_manual_module_3240.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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 5688 bytes
SHA-256: 012d80941eb2b150bd4032d4d387f80961e4cada7ea2560b4ec92a9dd645920a
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 11252 bytes
SHA-256: 6ae023c3a2327cd63ecd07067239e924a7f9b82ef1de2e183dbbadfd5b5ea965

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