Malicious PDF — malware analysis report

Static analysis result for SHA-256 085083fc225d2c74…

MALICIOUS

PDF

79.7 KB Created: 2021-02-19 22:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ccc2115791de7645d0f6144c3f2b17ba SHA-1: 622615fe89065a28d4eddb15c21bd75657e48b08 SHA-256: 085083fc225d2c741158faa73cddbf2704b5a221413184e1497c17a1ede9e966
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the pattern of a small PDF acting as a link farm on disposable hosting, further supporting the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=saifurs+spoken+english+book+price PDF link annotation
    • http://repaircreditscore.info/can_access_internet_from_mobile_hotspot_to_ps4c5uev.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/bulaz.pdfIn PDF document text
    • http://vomufitil.iblogger.org/abyssal_demon_osrs_guide.pdfIn PDF document text
    • http://vsedlyatebya.xyz/indesign_free_template_company_profiii22e.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/fallout_3_replicated_man_guide.pdfIn PDF document text
    • http://meweremidef.iblogger.org/81189707132.pdfIn PDF document text
    • http://antonioita.fun/why_does_my_dishwasher_not_clean_properlyuxd06.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/is_somewhere_over_the_rainbow_from_wizard_of_oz.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/gfxOiiE/kodable_app_for_pc.pdfIn PDF document text
    • http://1cats.space/naruto_shippuden_fondos_de_pantalla4gt0w.pdfIn PDF document text
    • http://xeeewq.xyz/unlimited_vpn_a_high_speed_apk8fngg.pdfIn PDF document text
    • http://soldonlakewood.com/xidebovabipizag5n7pc.pdfIn PDF document text
    • http://my-credit.info/concrete_abstract_and_collective_nouns_worksheetkf1x9.pdfIn PDF document text
    • http://iminn.ru/vanekijasivphm1.pdfIn PDF document text
    • http://mir23.xyz/batman_the_killing_joke_deluxe_editionrxse1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jobiduleger.epizy.com/8812762357.pdfIn PDF document text
    • http://tetozidix.rf.gd/mental_maths_grade_6_answers.pdfIn PDF document text
    • http://bepogakebite.epizy.com/what_is_the_bios_key_for_hp_pavilion.pdfIn PDF document text
    • http://mizebowofaz.epizy.com/83386178373.pdfIn PDF document text
    • http://newotev.rf.gd/96283156064.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 5584 bytes
SHA-256: 5c7c95b959ae9798f7ffefbae5237045088a67698e8428382748ab2fe1b33c2e
font_01_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 9232 bytes
SHA-256: e8acfc3db194d00521a86bdde4532d5d73104aff2deb924cf9d06073f6d7944c
font_02_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 2044 bytes
SHA-256: 01624431f96a61bfc8715dbe55fa6582eebccb2086b130e3ef258d16160d0055
font_03_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 10880 bytes
SHA-256: 812fbfcfcf873e4713e241f2fd2c1d528473603d3671bfb32cb83638ceb27dbb