Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca92571f60698525…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 11:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 891b552d2588ab13a509939726771b55 SHA-1: 2bcde05391b227cca391575974befd3f594adab0 SHA-256: ca92571f606985258b0464029a098b7527404ad2a21089fa715c2acac76a0e28
186 Risk Score

Malware Insights

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

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 0.9996

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 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.
  • 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://crophysi.ru/wix?keyword=butterflies+pinwheels+and+wallpaper+3.3+answers PDF link annotation
    • https://cdn.sqhk.co/vixukose/icgchcE/63413689177.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/alister_mcgrath_historical_theology.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/bJVgizQ/metal_forming_process_mcq.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/PjhJMjj/padepemepigutedawir.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/1sLue06/day_deals_sites_2019_near_me.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/system_of_a_down_toxicity_tab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ludugatitabi.atwebpages.com/cantina_band_clarinet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e1f0ed-48bd-4a37-8928-9d7cb1c2aba5/where_to_take_seashells_links_awakening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4226d3a1-5529-4df1-a833-3403c6739446/hp_4630_printer_wireless_setup.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_0b3d392d17134bc2983afd655993df7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b909db-5226-42c5-a5f7-5544c552bd47/51000050468.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/76366920864.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/quotes_in_the_adventures_of_huckleberry_finn_about_the_mississippi_river.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faf004d-7d30-4ced-b31b-c1e6234cd3cc/2008_ford_escape_transmission_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f37c05-f818-4cbc-aab8-2c2b7fed1c9e/lutevukizijokan.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/ralikegononugagekiwadizad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bc08ac-04bc-42cd-868d-564f268d9f57/50212860966.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_1b0d279f9f7f4d39a532affc99deb114.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e808adf-3770-4ea0-8305-35268652fcd1/45305562258.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/5336707815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e653fd61-dd96-4033-85e8-ff0d135e08c5/how_many_sarah_plain_and_tall_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/66138506727.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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 5464 bytes
SHA-256: 1dbfe979d53285d820bc32d62b8422141ca5438e1bacc8d94518daa3e499b247
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 10432 bytes
SHA-256: ba12a2e99abc72c27501be296918afad0bfc9e64c58a07665882608f5aedffbd