Malicious PDF — malware analysis report

Static analysis result for SHA-256 877a7cc94b331feb…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 10:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f28996785626a9463da4fadf170583f7 SHA-1: 1991fd2256143cac01a50a71cef9486b042daed2 SHA-256: 877a7cc94b331feba371641bc811779d521714e7bbff86a0651a2051494a201c
156 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, a technique often used for SEO link farms, with one of the primary links pointing to a potentially malicious PDF. ClamAV detection and ML classification strongly indicate maliciousness, likely a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to an 'anti-bullying policy template'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=anti-+bullying+policy+template
    • http://jefevivavifax.scienceontheweb.net/how_to_turn_on_sole_f60_treadmill.pdf
    • http://pevilolejuwoju.iblogger.org/marine_infantry_survival_rate.pdf
    • https://cdn.sqhk.co/jemitaso/EoTiahg/seloxe.pdf
    • https://cdn.sqhk.co/pevedapev/fheVgjM/baby_fetal_weight_by_week.pdf
    • https://cdn.sqhk.co/litawoxelida/jFgiLQ9/43843370136.pdf
    • https://cdn.sqhk.co/bezorufuv/jdhhVPc/pipe_3ds_max_modelling_tutorials_step_by_step.pdf
    • https://cdn.sqhk.co/wenewojufaj/gKwBihb/south_park_best_friends_forever_keanu_reeves_reference.pdf
    • https://cdn.sqhk.co/somupojebif/hdjgjce/bubble_shooter_dragon_pop.pdf
    • https://cdn.sqhk.co/waxipefimafa/Ob6gjif/karuxugujuna.pdf
    • http://rowowesofazov.medianewsonline.com/6878756199.pdf
    • http://xawamiwupajev.mygamesonline.org/jufejobemodimowajijoni.pdf
    • http://sifinujox.sportsontheweb.net/how_do_you_check_manual_transmission_fluid_level.pdf
    • https://cdn.sqhk.co/ximegawaso/chfAdn1/egyptian_museum_adventure_3d_mod_apk.pdf
    • https://cdn.sqhk.co/zokosofu/VJgcYib/78371921468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nitubak.atwebpages.com/winakuxi.pdf
    • https://s3.amazonaws.com/vibasujefir/antietam_cable_tv_guide_hagerstown_md.pdf
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_e98ec096280d4f21a8c1f7bed2239f64.pdf?index=true
    • https://s3.amazonaws.com/divelatoxa/due_diligence_findings_report_template.pdf
    • http://xofududegotu.epizy.com/godezuwazugufor.pdf
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_c32b16edf007497c8015d3787b8dca91.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/resume_builder_website_template_free.pdf
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_8b5e8a8ebbed4025acb1ad48a984d012.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f032.bin
d34771eb7ce319389eed672e76822be760e7163f9cd11912879a9d590737a542		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 5240 bytes
font_01_sfnt_off00010211.bin
40299697d459cd28903ee9697c39637bc7921dcf8ddade4bc1e6488c3c0721c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10712 bytes

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