Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c94a53acc5b5056…

MALICIOUS

PDF

81.1 KB Created: 2021-03-14 10:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 029160d62c087cefaebdf26eadf87ed3 SHA-1: 77d46a59cdf13d8248a1591b60857876d016d6c8 SHA-256: 4c94a53acc5b5056f94d06d956cad883c01f274dc81e0b782435d7f086739a8b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'supreme court worksheet answers', indicating a potential phishing or social engineering pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/wix?keyword=how+cases+reach+the+supreme+court+worksheet+answers
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/jeperixoluwu-selito.pdf
    • https://cdn-cms.f-static.net/uploads/4413458/normal_603630135c2f9.pdf
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/roporomumewuro_balazubulukub.pdf
    • http://hookup754.fun/gmail._com_freed7d16.pdf
    • https://lumewogomor.weebly.com/uploads/1/3/4/3/134319436/77168675.pdf
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/82a4571267.pdf
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fd1f662ed98b.pdf
    • http://bettermoneytips.com/bepubirawuwexirinoxukuw98hwx.pdf
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/97800d7.pdf
    • https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/lilaselamub.pdf
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5fff283c2bbf2.pdf
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/fanogawolofoxuvav.pdf
    • http://varietystore.website/how_do_i_improve_my_mobile_signal_at_homem8jkk.pdf
    • http://f1l3download.site/67566597796ubbiu.pdf
    • http://wssummer.space/92523360187t666f.pdf
    • http://neyroskakalka.site/zilisojexiwumonikufizozyhl8r.pdf
    • http://redtea.space/maths_genie_bounds_worksheetcy9x3.pdf
    • http://game-pro.xyz/balancing_equations_and_simple_stoichiometry5i0f3.pdf
    • http://futup.ru/cen-_tech_battery_charger_63043_manual2t1dm.pdf
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/46e5825906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_332cdc71c4d5472fa7b57a872303acbf.pdf?index=true
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_1a18c5dafbf84f09a45413115ce722f5.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_d6ca5c4986dd4cfab7613672082ea7db.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_off0001007c.bin
2050bb156f481caecd71e32f9be62c5d9d8c5c2c0a0e1c221fc7d5ed8e0b947a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 5256 bytes
font_01_sfnt_off00011242.bin
28a93061953dd298bf22dc20bfb0ea6256d300b82dbbc87345c9e045fd246a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 10700 bytes

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