Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e89aa84c6a8b9e…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 11:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 90203a1ee068c4501553efbcf61909ca SHA-1: 9c37d750e7ea57fe461bfa800f95774b3790a0c6 SHA-256: 72e89aa84c6a8b9e622f856714803d9fa7d6ec7bd5690ad608c62f1c39886721
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of links to external resources, many hosted on disposable domains or suspicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links, such as 'https://crophysi.ru/strik?utm_term=ejemplos+de+guiones+teatrales+para+ni%25C3%25B1os+de+primaria', are indicative of a link farm designed to lure users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=ejemplos+de+guiones+teatrales+para+ni%25C3%25B1os+de+primaria In PDF document text
    • https://cdn.sqhk.co/muwitajo/Tihilxk/dazalovumakiv.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/ifGjeja/how_to_iron_shirts_without_an_iron.pdfIn PDF document text
    • https://cdn.sqhk.co/sonometa/eVhedzF/80849800399.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/7280179.pdfIn PDF document text
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/2c1a4d2dd0c.pdfIn PDF document text
    • https://cdn.sqhk.co/ralajelisoju/jexGgcT/jkbose_10th_date_sheet_2019_jammu_division.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/fngijcx/openttd_tutorial_scenario.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/ludatof.pdfIn PDF document text
    • http://forpost-electrica.ru/what_does_e5_mean_on_omron_bp_machinefnv88.pdfIn PDF document text
    • https://cdn.sqhk.co/fokivetezabu/dhhhayl/26649726477.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/hjjaPKm/gartner_hype_cycle_2019_3d_printing.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/2702904.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenelavup/bxgiuhj/mht_cet_2019_admit_card_link.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/zEeIicH/constitucion_de_la_republica_de_guatemala_actual.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/hdHgidu/ice_cream_cake_dessert_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/JhcicvV/wellness_coach_meaning_in_marathi.pdfIn PDF document text
    • http://hamlikjorettoop.ru/160648777184acc6.pdfIn PDF document text
    • http://woodlesenka.ru/psychic_self_defense_dion_fortuneaw52t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1373ee70-8dad-494c-ae0b-16f7bf2416db/land_rover_discovery_2_off_road_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1117e457-e9e4-4321-984e-6d488bde5afe/vujibevanuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a6fbb0-6c70-4e1a-8f9c-979ab23b617b/how_to_setup_hp_officejet_pro_8600_plus_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235a8418-ae71-4891-b12f-1a04cc8320cf/fitikonuxanupixezisudozam.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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5524 bytes
SHA-256: 65779d25001fa79e025a792ec2400b490665c7d77cdc685934ec7c09593215a3
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 11512 bytes
SHA-256: 0f4e3abb8907aaaea236f37e4b71fa6543e3ef8117b76c705c5160c03010c0a9