Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d193dd53a55bf9a…

MALICIOUS

PDF

101.1 KB Created: 2021-03-19 03:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22259f8320f21809fe78b385ef9b69f4 SHA-1: 2ff635dfb1c2bf15470b3d0af6d1871f1e753d2d SHA-256: 5d193dd53a55bf9a6780d843c2d6d78bc27b5dfa71da14be1cf1268a71fdaa23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The embedded URLs are the primary indicators of compromise, likely leading to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://midufefew.ru/aws?utm_term=can+yeast+ferment+sucrose
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/9923b.pdf
    • https://cdn.sqhk.co/sazalevimit/jihc3es/strategic_leadership_definition_business.pdf
    • http://leree6.club/how_to_setup_canon_pixma_mx340_wirelesszb4ne.pdf
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/4409189.pdf
    • https://cdn.sqhk.co/zimidenex/ib2wt1X/nda_entrance_exam_2020_admit_card.pdf
    • http://ijmalan.xyz/danufawiwave28fgg.pdf
    • https://cdn.sqhk.co/sakixowofeg/Qqgheja/slackline_obstacle_course.pdf
    • http://imkl-checker.com/husqvarna_450_chainsaw_carb_adjustment_tooldhel5.pdf
    • https://cdn.sqhk.co/jagojixego/gf3dkED/tobeco_super_tank_mini_coils_compatibility.pdf
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/xobuxowarunijaro.pdf
    • https://cdn.sqhk.co/jonilinenuvo/iMOgdAj/57832101128.pdf
    • https://cdn.sqhk.co/tabafopevajo/eihij9s/acharya_balkrishna_aiims_report.pdf
    • http://busforpay.online/28359435280aa10z.pdf
    • https://momobamuv.weebly.com/uploads/1/3/2/3/132302987/fapatuzerarewa.pdf
    • http://fimewot.xyz/answers_of_chapter_combustion_and_flamehe7q6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jovekus/toshiba_lcd_colour_tv_remote_control.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/how_to_take_battery_out_of_nixon_watch.pdf
    • https://s3.amazonaws.com/lazolu/senagaresuz.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f0d.bin
5ed6fe3727a4cf2f80c3bdcac5ec3bf8f925ad9be0610457a0239b62e5543c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 4952 bytes
font_01_sfnt_off00014fd3.bin
6017db52ab299c0ec28154c3b39a5d14a6f197ecae6e66421f5448a4f5c0d009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD3 12816 bytes
font_02_sfnt_off0001793c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1793C 4324 bytes

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