Malicious PDF — malware analysis report

Static analysis result for SHA-256 5537428d724efa1b…

MALICIOUS

PDF

70.1 KB Created: 2021-02-26 18:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 31e07ed0e839bc09b757ae4899295972 SHA-1: 6b91bfb587b03897f307f689a8a5b983b76828d8 SHA-256: 5537428d724efa1bf9a446b3f4c0848f5c87cce8c36f52ab5182dadaccd35b02
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to a 'Eureka airspeed zuum manual', likely a lure to direct users to malicious external URLs. The numerous embedded URLs, many hosted on disposable domains or link farms, further support a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=eureka+airspeed+zuum+manual PDF link annotation
    • https://cdn.sqhk.co/muvasesuru/dhgAlTo/47193831941.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/gjVChqu/stupid_zombies_2_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/fwihgdD/can_i_buy_on_ebay_with_gift_card.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/TQRu01b/44729585361.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/avatar_comics_imbalance_read_online.pdfIn PDF document text
    • http://znatural.space/96817770980cg4nt.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/briggs_and_stratton_500_series_158cc_carburetor_adjustment.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/bijhhEF/tomb_raider_4_dreamcast.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ggiKgjb/fekoxowakuwimasuva.pdfIn PDF document text
    • http://workshop-fb.ru/basic_security_testing_with_kali_linux_2_free_downloadhs7rv.pdfIn PDF document text
    • http://tifeguga.22web.org/at-_lp120_usb_manual.pdfIn PDF document text
    • http://instapresent.site/green_papaya_salad_recipetin_eats85swf.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/gekLhcx/fozimagexepox.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/how_true_is_into_the_wild_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/hhMijib/moto_g_stylus_specs_phonearena.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/hT0idhg/wuwadutekipagomej.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/HAje8Wp/93191230961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lisowinuxofifok.rf.gd/angular_reactive_form_disabled_input.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/solujelurunivijin.pdfIn PDF document text
    • http://degudodenotiva.rf.gd/farixafezanisa.pdfIn PDF document text
    • http://lamiredej.epizy.com/android_development_action_bar_tutorial.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/dazizorekimoliperuke.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_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 5176 bytes
SHA-256: 8e18d1406449a6757051e59a2671e2e3f0b4ff9a5ae78731af13288799af3ab4
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 11888 bytes
SHA-256: 6d27139bad384ce56f406c92ea38305ab2304587fe9090e368602f268e383c1a

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