Malicious PDF — malware analysis report

Static analysis result for SHA-256 6250a3eca7241154…

MALICIOUS

PDF

77.8 KB Created: 2021-06-13 06:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5ff7cc341c6ba2a95c1bd0c263215ac8 SHA-1: cf0b0df915ef68c48825891785f838671d889bae SHA-256: 6250a3eca7241154936f1d6a6268acbed21c40eebf8fec44be874d2063694797
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, which is indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/pbw?utm_term=wild+rift+wukong+build+jungle PDF link annotation
    • https://fozuwopakinijur.weebly.com/uploads/1/3/4/6/134617915/3446316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ffa15037c6cf.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/5958778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5ffe7d1862c3e.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/tukelapegow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_60693af676213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xanovobuxebo.pbworks.com/w/file/fetch/144886581/differentiate_between_network_and_networking.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144821418/ap_stylebook_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf249a4a-1988-4c72-8f96-442d0fde08d8/why_is_my_shaw_modem_blinking_orange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426d93c4-32cd-46f6-8cda-5d4484ca1c35/degomamapoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5003a8-1b45-497b-ace1-99eb806f8dbd/unit_4_test_study_guide_congruent_triangles_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b5685c-6080-45b7-b3ec-5c530566000c/husqvarna_323l_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15e2530-b212-4938-8570-078142df645c/how_to_open_a_locked_beko_washing_machine_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b13cd89-d506-4139-9ecb-fecc5cabdf2c/big_nate_blow_the_roof_off_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bced10-822f-4ef2-b0e2-3b069abf6ece/nugagojudesikefeloru.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/gutedezunixenokujowiz.pdfIn PDF document text
    • http://duvetemeb.pbworks.com/w/file/fetch/144973938/two_step_inequalities_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac1ab37-c26e-4ce0-8c52-f201a1f28266/tabla_de_conversiones_fracciones_de_pulgada_a_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a0521d-9e73-4b75-a50e-c1a43b406b1b/52288405092.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_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 2900 bytes
SHA-256: c4c77de79185a6e32b969612b4158c72aca0a6965e648bc7cf893bc7a336abbf
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 5072 bytes
SHA-256: 4a1955bb357597af7f7949f4e85f68cd3f27d28be9097c25c1ed5c3b87d58cfe
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 10676 bytes
SHA-256: ce07d7f9d7bf91b7b4f0310cddca5bd464ef046c443a20d94a3e3c5018b16b93