Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a6b4e5a6b8cb0e…

MALICIOUS

PDF

77.5 KB Created: 2021-06-07 05:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8c009d75a62880eabc4bfd06809bb31a SHA-1: d17fe0d218c8608c249e1371f703b6bad234c5d0 SHA-256: 26a6b4e5a6b8cb0ea8ee82c5828ce9886a20ffd1875ebc641e128c5a4a7921eb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as a phishing trojan. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://queure.ru/pbw?utm_term=b%25C3%25ADblia+pdf+download+gratis PDF link annotation
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/8563354.pdfIn PDF document text
    • https://wakowugiluto.weebly.com/uploads/1/3/5/4/135401031/59c822cb3e917e6.pdfIn PDF document text
    • https://semufevesi.weebly.com/uploads/1/3/4/7/134733881/sosili-luxosepirazow-vanope-megox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_60b9498bcfe76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_601fe0e43e014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_602567f968cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_60233d2e31d82.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/9c52193c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375699/normal_5fde88e695c31.pdfIn PDF document text
    • https://mumotajesok.weebly.com/uploads/1/3/0/7/130738730/tazivudofidipit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_603389fbd88dc.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/jameteruje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_602a9cde136f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476580/normal_5fddbd84d13cb.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/e6e1b9dc6b6b587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_60491bb6b6b1f.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/9004ca77-ac38-4844-baf4-d61102c50f30/zinariwudepegudeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d9cd12-b058-46c5-9fb4-69bce049f47b/traductor_de_ingles_a_espaol_para_android_sin_internet_apk.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144446898/mx_player_codec_1.9.8_armv7_neon_zip.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/f/rigujiwaraseno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75edc1db-f4d4-414e-bc34-027c20de7259/how_to_become_a_certified_forklift_operator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38a0d50-9eef-499b-8e60-b9f783058098/nopadadeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8b5934-0c91-40c7-bfec-757c06f954ce/who_is_the_leader_of_the_goblins_in_the_hobbit.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/tijopawanup.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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 5216 bytes
SHA-256: 7e1f67bf965ee74dbd4863b3e42ff140487df22a9d659f577a4dfef7182921b7
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 12648 bytes
SHA-256: 444d2e39117215e55d731e76265a96e20b8cdc9b70f0fe7041af9c1e2c7c77e6
font_02_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333