Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5423927ad55590f…

MALICIOUS

PDF

94.4 KB Created: 2021-05-18 10:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e2a2cbffe745f0256c5b1520336bec98 SHA-1: de2653ed89ae44dc04576205623821060694a7ee SHA-256: a5423927ad55590f509cc879ef15a2d2b1d7afedefda9999fe7439790b0fad7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, and one of the primary URLs points to a domain associated with malicious activity. The presence of XFA forms and the ML classifier's high confidence score further indicate malicious intent. The document body, though partially corrupted, suggests a lure related to academic performance to mask the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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=review+of+related+studies+about+factors+affecting+academic+performance PDF link annotation
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/vogobulifesa.pdfIn PDF document text
    • https://dawejiji.weebly.com/uploads/1/3/4/5/134505451/7478459.pdfIn PDF document text
    • http://rigeduvutenis.22web.org/watojarexiputugosoweju.pdfIn PDF document text
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/duwadibi_lilizunipunig.pdfIn PDF document text
    • https://foxufaba.weebly.com/uploads/1/3/1/4/131482874/mupivazenenuz_bidiwozudo.pdfIn PDF document text
    • http://xufadaxedi.22web.org/bca_mathematics_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vikipabolukizi.rf.gd/ameritron_al-811_amplifier_review.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/how_to_chart_weight_loss_progress.pdfIn PDF document text
    • http://vimiromomekex.epizy.com/14873913678.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/62617798282.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/zanixemigepumeroroken.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/define_bezoar_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/jawigukigaxetulokabowekox.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/practical_bacteriology.pdfIn PDF document text
    • http://jasilowesuvus.rf.gd/aflatoxin_broiler.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/5851447555.pdfIn PDF document text
    • http://mamesejo.epizy.com/connected._mcgraw-_hill_answer_key_geometry.pdfIn PDF document text
    • http://kiwuvapinemugi.rf.gd/boss_katana_tone_studio_manual.pdfIn PDF document text
    • http://woniwasazox.epizy.com/dynasty_series_5_episode_guide.pdfIn PDF document text
    • http://mifevup.rf.gd/41475357093.pdfIn PDF document text
    • http://ponenasese.epizy.com/crime_scene_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/cirebon_electric_power_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/permutation_and_combination_problem_and_solution.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_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 5772 bytes
SHA-256: e1672dad3ce76c9aaaa0285b075453d8693d2930ed28465c3886cab3a42a8275
font_01_sfnt_off000144b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B0 11316 bytes
SHA-256: deb989de141971b938844875a6ad36730241073b160f72a3a152f57f3ea5ef9f

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