Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8e217d43e9e51f…

MALICIOUS

PDF

81.3 KB Created: 2021-04-08 00:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f11c3d0a7feee083456c4968b6b86c57 SHA-1: 19336aa5f50e463da0c45e55a79600e7c985fb76 SHA-256: cc8e217d43e9e51fa74e267a9ce2741e2f00dd32e5f4faff83d38fa3af161f4f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many of which point to suspicious domains, indicating a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=draw+and+label+the+five+phases+of+the+cell+cycle
    • http://vkrowl.com/download_apple_music_pro_apkwaglm.pdf
    • http://passive-income.ru/kefajapoxifela52ep4.pdf
    • http://cancandance.org/bloody_bloody_andrew_jackson_sheet_music52ca0.pdf
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/9b32cf759b.pdf
    • http://ita-bio.fun/17999225943x938d.pdf
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/ditazorogezisofi.pdf
    • http://creditinquiry.info/h3po4_is_a_stronger_acid7151j.pdf
    • http://worldthailand.fun/14020514999the2w.pdf
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/fb234ee1b63a73.pdf
    • https://joworuzofoluj.weebly.com/uploads/1/3/2/6/132683209/1ab026aaa3.pdf
    • http://kernig.pro/zimefavujusirezj7zdo.pdf
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/namosireziwebibekuje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2e675f2c-1b27-430d-97b3-fb98ef674265/can_i_play_minecraft_java_for_free.pdf
    • https://uploads.strikinglycdn.com/files/f3ac31fe-edb2-45fb-a579-94d9a2bf367b/lujojomifemolu.pdf
    • https://uploads.strikinglycdn.com/files/cf03c0c7-a87e-48da-98c5-0b4593899f1f/2056531210.pdf
    • https://uploads.strikinglycdn.com/files/e9cc282e-c414-4dd2-8bcf-bd029d36b5c0/tunolameximafok.pdf
    • https://uploads.strikinglycdn.com/files/6bb1413f-7601-4da9-be9b-924cd4ae9591/sta_rite_pump_lid_o_ring.pdf
    • https://uploads.strikinglycdn.com/files/d4eeccbf-ca15-46ad-b507-2a11f5e96638/what_can_i_do_with_a_communications_public_relations_degree.pdf
    • https://uploads.strikinglycdn.com/files/117e5a0f-d36c-4a02-ab20-da24267eadf4/vofazuwikamamefakigewuvip.pdf
    • https://uploads.strikinglycdn.com/files/eb276d2c-815c-41b0-a684-7c25dffa90d8/bow_tie_cinemas_annapolis_harbor_center.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101af.bin
9870e14f8875ca78998423bd4cbb2d15dfe4ed36dbfdab21d192a9500040a661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 5636 bytes
font_01_sfnt_off000114f7.bin
e9b06952fdd69f0e64cbd6e3d0f4b061bf288c60f3e8a170cb3e5ac563b071b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 10184 bytes

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