Malicious PDF — malware analysis report

Static analysis result for SHA-256 903c5fadcfda3bf9…

MALICIOUS

PDF

73.1 KB Created: 2021-06-08 19:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 959190aacc36e5f414211aba2e0af3ab SHA-1: 56346cb9a8586891c1c61fc1f81349c7028dd7b1 SHA-256: 903c5fadcfda3bf9a46ac844cbf89f07d7cf5448dec7ace5326e2ae458751316
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be related to movie downloads, a common social engineering tactic. The presence of multiple PDF_SEO_LINK_FARM heuristics and a high ML score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=apocalypto+movie+in+tamil+dubbed+download PDF link annotation
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/rabom.pdfIn PDF document text
    • https://lapimirisa.weebly.com/uploads/1/3/4/3/134372347/1425707.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/sulalurubeputekewu.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/5fd4a256df01.pdfIn PDF document text
    • https://zapaviboxoxag.weebly.com/uploads/1/3/3/9/133997465/wemabevilut-kifudojupilal-taxilidi-xobezogiremi.pdfIn PDF document text
    • https://lipixebuz.weebly.com/uploads/1/3/0/7/130740586/2457268.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/61c08e5c-d4dd-4407-8498-766bbdac0f07/adewale_ayuba_songs_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7d6e16-d627-4af7-980a-c83518ed08df/conceito_de_planejamento_segundo_vasconcellos.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144652899/subject_verb_agreement_quiz_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d33ed0-1fa3-4a3d-8227-0a3191e9f2f3/sky_shattered_wow_achieve.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/22610327837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab80c2d-1b53-42d4-8b38-220a928889cb/la_botica_de_la_abuela_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f4417d-7bcc-4385-9068-79e9b655f7f6/16308385855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78aba1a-f145-470b-905b-cd928cf61ba1/str_dh130_review.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144620460/arabic_calligraphy_books.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422319/3899302553.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144560913/all_legendary_alpha_pack_items_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bdbf2c-406b-4c36-93c4-a81947f103e7/how_to_know_if_your_mind_is_powerful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd71e74-8825-4ec8-9701-a3fe472a5ea0/how_to_study_for_surgery_rotation.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 5328 bytes
SHA-256: 6cb77f3d3d5ddf1200f1a02034baa1027ab66cc7f5eddfe0376a45e660b857d8
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10564 bytes
SHA-256: 8060dfbf1d9ca6caad9fc235b8762ad052da7a4238901b4a18fc66b95ebb5dd9