Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5336332b8b92022…

MALICIOUS

PDF

80.7 KB Created: 2021-05-23 16:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ed8ca43dec44cd6885800e71e70d8d8d SHA-1: 9f1e47d9f772530453dbd6040eb881b03dca874c SHA-256: d5336332b8b92022c27762b58d9a1e6813e987117ce1c63a01e718d75c1fb045
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=sindhu+bhairavi+serial+in+tamil+latest+episode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376105/normal_60388a4a93101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_60010b3ef3b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60164d495a268.pdfIn PDF document text
    • https://gadefume.weebly.com/uploads/1/3/4/3/134337819/jakugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_602752664f5d4.pdfIn PDF document text
    • https://wumotobabupe.weebly.com/uploads/1/3/0/7/130775865/43596c9e526.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5fc9d9a1765b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_5fd36f9a2d0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6026f7923a6e2.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/4865951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5ff5742f1821c.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/2684e6652d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_605c10969afe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409250/normal_5fe42f7518ee4.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/c0ebba37-667a-48cd-80ad-4c7e6c51ffc0/gezutedirifolerew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6bd573-a270-4d05-9e36-812f72193e2f/sierra_ingletadora_makita_ls1030n.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/krugman_economics_for_ap_teacher_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7b0a29-dbd7-41c1-853b-9d066e588ac7/95236188875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cc9818-9f9f-4723-b0f0-5fd7ea57c0c9/arduino_uno_r3_atmega328p_pin_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/what_is_beneathas_dream_in_a_raisin_in_the_sun_quotes.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
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 5504 bytes
SHA-256: 061d3562a3935c3cd1f1f85fa53c1a57e98589f961a961823f56287c233fb0ad
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 5924 bytes
SHA-256: 315af0ee3c52948cc5b2f27502fae247bff8c48e7ee545695fee89a6a7e7237b
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 11392 bytes
SHA-256: 3b2c1c9d41ed051d9b8f855c7c1c3d43e54aa4c17cb396e1582d319a60ad16d1