Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caba43d957b6453…

MALICIOUS

PDF

73.1 KB Created: 2021-02-17 19:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 755440ed789dfb43d3c05924c5c838b0 SHA-1: 80d06b45a639d482c551c9abd6ca19b3086ee3d4 SHA-256: 0caba43d957b64536f88e72cced942eda622c654691b0b9568424a8d2d3aef21
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with one prominent URL pointing to 'bologen.ru'. The document body, though heavily obfuscated, appears to be a lure related to 'enthalpy of formation'. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://bologen.ru/strik?utm_term=what+is+enthalpy+of+formation+class+11 PDF link annotation
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/litika_lapuvosamomuju_bukakamodak_momegexowirijen.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/2733546.pdfIn PDF document text
    • http://krepezh.guru/501_synonyms_and_antonyms_answersksidz.pdfIn PDF document text
    • https://wosufibataba.weebly.com/uploads/1/3/4/8/134866098/4009802.pdfIn PDF document text
    • http://sawozuduridab.iblogger.org/luduvojikamuvufa.pdfIn PDF document text
    • http://kexedoliresile.22web.org/72003599396.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/97e85060e41b56.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/50550394610vwpyy.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/tevigotu/le_marxisme.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/us_citizenship_test_questions_without_answers.pdfIn PDF document text
    • http://xivavop.rf.gd/low_temperature_acclimation_certificate_statement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/stem_and_leaf_diagram_questions_and_answers.pdfIn PDF document text
    • http://lejokadedemixo.rf.gd/rololidapo.pdfIn PDF document text
    • http://bologipegokofi.epizy.com/make_individual_worksheet_read_only.pdfIn PDF document text
    • http://takugiwem.rf.gd/good_morning_america_weekend_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/robotics_engineering_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/android_alarmmanager_start_service_example.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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 5420 bytes
SHA-256: 836f5884a46b2a7354de27647d435d77edaaad88199b9bf571895142fb82b993
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10712 bytes
SHA-256: cff34c7a7addcc40a064bead04f431e6224212b36bab37a14ebfc77370924743

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