Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90f881eb59e2ff5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-08 15:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7fec0f91a7fbf26918f3486dd453956a SHA-1: 19469fbbb7b2f2b2cd5ab4860c8ae5fd9c02d774 SHA-256: a90f881eb59e2ff5a313e3d56d8c085a9de0588dc0f8ef2b4170c73c78d7cde0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://pelibifir.ru/award?keyword=abrasion+atricion+erosion+dental+pdf PDF link annotation
    • http://blue-tick-central.com/water_resources_engineering_related_jobs_in_indiau8frh.pdfIn PDF document text
    • https://vajubepodeno.weebly.com/uploads/1/3/0/7/130776779/725c20d4f.pdfIn PDF document text
    • http://hamlikjorettoop.ru/java_8_booktawp0.pdfIn PDF document text
    • http://sputnews.com/tcp_ip_stack_vmotionkk6g8.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/ie2ifid/2_player_co_op_games_ps4_2020.pdfIn PDF document text
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/kubuvelimemomif.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/suvimuwekuvox-bonunugunaf.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/lirazepenefuze_dojubikurisefo_simonivabuvitig_rugitav.pdfIn PDF document text
    • http://ig-copyrightnotice.com/oppo_bdp-103_region_free_kitocwva.pdfIn PDF document text
    • https://goneduxif.weebly.com/uploads/1/3/0/9/130969586/2153996.pdfIn PDF document text
    • https://cdn.sqhk.co/rijolumexeb/hfgckUT/saudi_arabia_vpn_apk.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/c10f752e-b701-4988-96be-e968f6bdd278/how_to_replace_ice_maker_in_kitchenaid_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55690105-e530-4c40-9ae0-fa57ffd4af25/6760391403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97f7800-681b-4f35-94f7-07b5d497673e/tupazetixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11316be-b202-495b-8f69-9200fe2434e0/79114539032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65d0575-99c1-419d-b060-26f6307d7386/sapugodemogot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f561edd6-6461-4d65-ae07-53c531f0936a/25646587449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa6093b-924b-42c1-9205-911c3ac120c3/37504401388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ecd40f-21bb-4f50-8ac1-d3f3f3953d13/jopukujapinowenawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8abda3c-f6d1-4e10-8f28-6ec09b12d456/70218579619.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_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 5276 bytes
SHA-256: f9e4199b031f3d7ea18360910670ffc26b6acf348f5e249ee3150979576af85a
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 10100 bytes
SHA-256: 6acb0b26fa301aed4f14bab874814df4dd35a2b6df2ab7fa3d3ff66ee481262d

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