Malicious PDF — malware analysis report

Static analysis result for SHA-256 4564030c5861e71e…

MALICIOUS

PDF

83.0 KB Created: 2021-03-22 20:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bac0b3644c9a50f5b78cd4defbd505c3 SHA-1: 2fa709464af9c20c7cb70892a98bdefc2669515e SHA-256: 4564030c5861e71e10d4437ea9cc02dc3d43a79ff2cdcb439cf64cc67f5622d6
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to reference game-related keywords, likely as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=helicopter.io+game+unblocked PDF link annotation
    • https://wekowegalovu.weebly.com/uploads/1/3/4/6/134668649/7663456.pdfIn PDF document text
    • https://fozibopabedabe.weebly.com/uploads/1/3/6/0/136082219/b154ff.pdfIn PDF document text
    • https://noduxexoretan.weebly.com/uploads/1/3/5/9/135993764/9558550.pdfIn PDF document text
    • https://xetibipu.weebly.com/uploads/1/3/4/5/134528590/xusoxuzalizus.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/167520088962q31p.pdfIn PDF document text
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/43412.pdfIn PDF document text
    • http://zadidibupinumav.22web.org/swimming_pool_lighting_design.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/xinimofadunom_zobonol.pdfIn PDF document text
    • http://piloderib.22web.org/weight_calculation_formula.pdfIn PDF document text
    • http://reduslimitalia-official.site/jeevan_amar_855_proposal_formlof7e.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/2395356.pdfIn PDF document text
    • http://discount50.pro/85507478554rj3w8.pdfIn PDF document text
    • http://upgrade4me.com/36480911585l8v3f.pdfIn PDF document text
    • https://pisukobuvasojab.weebly.com/uploads/1/3/4/3/134398412/b348bff.pdfIn PDF document text
    • http://kotigowaxed.iblogger.org/29430753003.pdfIn PDF document text
    • https://lakafirawitekir.weebly.com/uploads/1/3/4/0/134018328/6958561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f7f296bd-8637-4f75-83c3-d3e65c9042f0/what_wire_is_used_in_houses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b652dc83-8ea3-4b7a-b4fd-1b6f2e7c447f/canon_eos_rebel_xti_400d_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e98283-301c-4a56-ac53-2bccbb9603e2/52033550285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46faa57-a5c2-45af-bf73-077ad5ab2031/84853901787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700b0d43-862d-4dac-8c79-b8e54f2d51e8/jawegamijelidedogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c1052d-090b-4c3f-9ce4-9310b673ee3a/does_every_living_creature_have_a_brain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d79db4c-f3a3-48ef-95c9-7ae0f4c01efc/how_to_pair_a_soundbot_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5a42ad-8ecc-4aa0-94ef-b5d3e94d5176/what_is_the_message_of_auld_lang_syne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336f3a80-ffee-4165-83e3-668ca141259d/angles_of_polygons_coloring_activity.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 5296 bytes
SHA-256: ac560dc1517b2827cc7499f5500315fbb9a83576db4f4ce6feb0ceffb0779b20
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 11244 bytes
SHA-256: dc3ef5d20a24dd52c1aac9cc79c41e6dfb3127eeda0cbec5289d59653dcd7c01
font_02_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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