Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9b3034966e5ea…

MALICIOUS

PDF

64.0 KB Created: 2021-01-20 19:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea797971789c2183b9f611640698bda5 SHA-1: f376c5fbf3def168c3e67e6cd23e02e1a9986498 SHA-256: 33a9b3034966e5ea2c299cc529c27cfe5a2c051c824d8ab0e9cfeb513251501e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL suggesting a lure related to "Bobcat 610 parts manual pdf". The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, likely for SEO manipulation or to host malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9731

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://baarspo.ru/123?utm_term=bobcat+610+parts+manual+pdf
    • https://cdn.sqhk.co/xakelafu/sgcPGhe/47541506394.pdf
    • https://cdn.sqhk.co/vurifozi/jejhjhe/talking_tom_gold_run_gameplay_online.pdf
    • https://cdn.sqhk.co/goberirud/jeggt9L/elsa_singing_doll_frozen_2_11.pdf
    • https://xalovediluf.weebly.com/uploads/1/3/1/3/131380345/8253241.pdf
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/5b581d5d8dbc9f.pdf
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5fcf3691df832.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd6541eb0117.pdf
    • https://cdn.sqhk.co/fanabezom/gihahcg/dungeon_keeper_2_cheats_won_t_work.pdf
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/1894213.pdf
    • https://tunozuranoba.weebly.com/uploads/1/3/5/3/135316660/sakunavaramukinem.pdf
    • https://cdn.sqhk.co/kanedufopuma/NAhhohd/executive_administrative_assistant_jobs_near_me.pdf
    • https://cdn.sqhk.co/najiligopej/zem1qjd/smart_and_final_fresno_shaw.pdf
    • http://tojagetuwiger.iblogger.org/3471038519.pdf
    • https://cdn.sqhk.co/tumosirewuw/zjgieyq/gupevafososapaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kelawezup.rf.gd/38989989330.pdf
    • http://nisuzadusidu.epizy.com/avery_address_labels_template_18160.pdf
    • http://sajipesexadagon.epizy.com/information_of_fashion_designing_course_in_marathi.pdf
    • http://gonoluripep.rf.gd/faxagadif.pdf
    • http://nerokezixuzat.epizy.com/brindisi_traviata_piano.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7b.bin
a41fa03f56e109d87a8c27c8185d24c7fd27ecd51aeeb8cdd32183198f26f365
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 5836 bytes
font_01_sfnt_off0000de41.bin
1654022ff79b5bd6cd4639eec2dac62587fe21a60409e3cde4e1ad89dd58df3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 10268 bytes