Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27e04b355832dc8…

MALICIOUS

PDF

81.5 KB Created: 2021-06-14 12:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 91c1ac995fec892abf9e7be5c5e61514 SHA-1: 46b208e55602067e17970252f879dc30eda51e2b SHA-256: f27e04b355832dc81249d81a2b3f105c9d6c044380d097503953f87fae19ef2d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. One of the extracted URLs, 'https://dugedepap.ru/123?utm_term=update+huawei+p9+lite+manually', appears to be a lure for users seeking device updates. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/123?utm_term=update+huawei+p9+lite+manually PDF link annotation
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/36129ffe2ef0ea8.pdfIn PDF document text
    • https://gerulelib.weebly.com/uploads/1/3/0/9/130969354/tupiperuvu_rirafareburuga_witozuvitasol_ninuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_604ab344c037a.pdfIn PDF document text
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/kasefadebi_jufabukag_katewemo_bavap.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/af62e53ee.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/3128027.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/kazofupip_dudapudi_figuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_6012267481fac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5fef4330d22e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5feaecd39ab18.pdfIn PDF document text
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/rikarejem.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/13a064d5-5822-4494-9adf-5af8dea1cc93/what_is_the_15th_book_of_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ed4afa-2d5d-47fc-9ba1-00afbca621ae/who_is_rhea_and_cronus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa55fe6e-c0e5-4a15-b9dc-dd08b85ffa2e/glencoe_geometry_chapter_4_quiz_1_answer_key.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144810210/how_do_i_set_the_date_on_my_smael_watch.pdfIn PDF document text
    • http://keborekudud.pbworks.com/w/file/fetch/145169562/electronic_configuration_30_elements.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/145107102/seed_minecraft_diamond_village.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b227567d-e1ea-450b-a126-610b6902b12e/norstar_meridian_m7310_phone_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c15a04f-2f29-4b5a-9976-3709f74915a1/how_to_run_a_print_head_nozzle_check_epson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb15b49c-e264-4ea6-a6c7-8be5a154487c/tedus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc81751-da19-41a4-820b-7e150cc65f9f/derek_prince_youtube_blessings_and_curses.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_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 2912 bytes
SHA-256: f725b616a1add9e943c6eb4fb6e7c9f4993d2e6aee03ef0522a7e9ab2836f318
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 5264 bytes
SHA-256: c2cd112b18773b5d72ee1fdd1762d0a316c487a949c40bcc8271ce898d4d7707
font_02_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 11060 bytes
SHA-256: 175912411aa98236f01ce9bf5471ea1eef28ee8e789c6822a51de62b395ee1bf

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