Malicious PDF — malware analysis report

Static analysis result for SHA-256 23555bbf73a21dc2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 14:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f59501e9f61b4749be35d5135b67b6bf SHA-1: a8f4d1c0561b9449c1f6d244339246e219c2fe9c SHA-256: 23555bbf73a21dc2800fc3945a4ab53d8abea74fd78fcc71389c7c257ea075fe
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into visiting a site that likely hosts further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/123?utm_term=academic+recognition+information+centre PDF link annotation
    • http://oneitshop.info/heroic_fantasy_definition_literaturey1tc1.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/danalefo.pdfIn PDF document text
    • http://itawegan.fun/how_to_draw_a_girl_figure_step_by_step72m6h.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/ravubefip.pdfIn PDF document text
    • http://zathkatow.xyz/tigupifivosenekojipabosed2pp.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/what_is_supervision_in_social_work_for_students.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/4042479153.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/vazaparire.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/krups_nespresso_coffee_machine_troubleshooting.pdfIn PDF document text
    • http://vipadminler.org/mipeluruz1w9o4.pdfIn PDF document text
    • http://ipai.online/284155643114gzem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sejakopa/gopro_hero4_silver_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/83024447358.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/76681132564.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/tudorutuzukujesulomaj.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/how_to_get_a_fake_email_address_for_facebook.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/dajejizopaxulimimizavob.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/27785840970.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/best_friend_copy_and_paste.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/can_you_day_trade_under_25k.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/rowabosika.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/bluedio_t_elf_gt_review.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 5120 bytes
SHA-256: dca382a2a5b14e97a5c72500ce2f37b4b933e4f592b5b7a7a593b61e928c4467
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 11076 bytes
SHA-256: 31dfb18f3575f5032fe1ae2eaabbe73ce46afb5b240d700e0ccda2fdf3407524

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