Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a935c35429df2cf…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 09:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c9cff39693b84f06545a9a949a260dbb SHA-1: 04eae88f67dd69b4bef28a0568b1afcf63c1c052 SHA-256: 0a935c35429df2cf85a26292b8019a7990fa3853e09138a2be0f5c273e0cf628
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, aligning with common phishing tactics.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/123?utm_term=figurative+language+review+worksheet+pdf PDF link annotation
    • http://tikovg.xyz/fofudojexupilanmyzsy.pdfIn PDF document text
    • http://medgaj.com/how_to_divide_decimal_numbers_by_10003e0r3.pdfIn PDF document text
    • http://cheatyou.site/ice_hockey_stick_tape_waxdtt19.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/zimobomafo.pdfIn PDF document text
    • http://afracheat8.xyz/como_agua_para_chocolate_resumen_por_capitulo1hdig.pdfIn PDF document text
    • http://hargotel.xyz/vosarjbw9w.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/basic_anatomy_terminology.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/which_weight_watchers_scale_is_best.pdfIn PDF document text
    • http://it50disconto.info/95303958982428sz.pdfIn PDF document text
    • http://anarchymedya.com/gawesubeji25o.pdfIn PDF document text
    • http://atomyimperial.ru/78767120811ahjn2.pdfIn PDF document text
    • http://1-bog.ru/2005_dodge_ram_1500_4.7_performance_upgradesvdb3a.pdfIn PDF document text
    • http://pochta-24.cc/6493030262ioos6.pdfIn PDF document text
    • http://bluebadgeapproval.com/panasonic_omnimovie_vhs_battery_chargerp6hqq.pdfIn PDF document text
    • http://torchland.xyz/manual_de_router_tp-link_tl-wr841n_en_espaol14cmh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizuzol.onlinewebshop.net/what_was_life_like_in_the_elizabethan_period.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_a378476fbed7456d924df7f51ad71b46.pdf?index=trueIn PDF document text
    • http://zujazeku.epizy.com/25652556022.pdfIn PDF document text
    • http://felubefetixiwu.rf.gd/suzajefekulijizegatomi.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_1046961528d849e0b69005a26b48d5ae.pdf?index=trueIn 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 5476 bytes
SHA-256: 8c291d8cd9a0ae11305273597e35d30168783deeb69405bc41e0b878834095a6
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 10772 bytes
SHA-256: 4cb0f6d063ca7db8ecfdeca13af1e4262d0ccc43a9c2812646ee9e0a2c17de59

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