Malicious PDF — malware analysis report

Static analysis result for SHA-256 729eb43ec6992d71…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 17:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ac828f194998eef6209b2d914d6b355 SHA-1: 94443e44d2197b53319947349d0e64a67d0cf885 SHA-256: 729eb43ec6992d71dbf51ba5fd77fabdc391af41fb3f1b087c1a523500ef8cd7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=fried+brussel+sprouts+nutrition+information PDF link annotation
    • http://xufegabuxugil.iblogger.org/bigo_live_free_uptodown.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/how_do_you_do_conflict_resolutionyc62q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374207/normal_6006168cad3d1.pdfIn PDF document text
    • http://lasns.fun/how_to_pronounce_egyptian_hieroglyphicsn2w5m.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/bMiggjy/spin_blade_elite_10-_30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_60603bd07ce1e.pdfIn PDF document text
    • http://zeropium.com/video_er_opera_store6fl0o.pdfIn PDF document text
    • https://cdn.sqhk.co/kujaruwajovi/84gdTji/gapipimijeve.pdfIn PDF document text
    • https://kufurana.weebly.com/uploads/1/3/1/4/131482954/92bc2bc2338.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/hcbEtBS/apps_like_layout_for_instagram.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/jowepudijevav_pukef_junusuxipatefe_poniduviwuka.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/qijjjA0/words_meaning_night_hunter.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/rulavat-mipodotuko-jojagemoguwafub.pdfIn PDF document text
    • http://maximizator.xyz/79643921268eslkz.pdfIn PDF document text
    • http://negimemexib.iblogger.org/22752575897.pdfIn PDF document text
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/rupibosab.pdfIn PDF document text
    • https://musigimipipo.weebly.com/uploads/1/3/4/4/134470090/situnimamurora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokezaja.epizy.com/86322987702.pdfIn PDF document text
    • http://juxugalipexobow.epizy.com/airfield_ground_lighting_system.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/toxoplasmosis_and_pregnancy.pdfIn PDF document text
    • http://lekekavom.epizy.com/tavefusuzudorazebopaze.pdfIn PDF document text
    • http://sonisan.epizy.com/bumblebee_piano_sheet.pdfIn PDF document text
    • http://xabigobagexuk.epizy.com/22339955619.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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 5280 bytes
SHA-256: 075acf95ebf626c78fc36b0078221ecf2794f3cf895962a6a563e08836b29013
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 10748 bytes
SHA-256: a383559ac44a9bbcf220dd6e1c84e3084c0b5db1c874145564898b0716fa929b

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