Malicious PDF — malware analysis report

Static analysis result for SHA-256 f983ad90ef9bf838…

MALICIOUS

PDF

80.0 KB Created: 2021-05-08 11:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 138a91659c0a529b970149cef41c56d9 SHA-1: 308c0fb67f6baa1295f392592ac57ae34be73212 SHA-256: f983ad90ef9bf838a3a02c066b2f75fcbe12979350a92a00a10c2bc8f52cf833
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, and is flagged by ClamAV as a phishing trojan. It contains a link farm with numerous external URLs, including a primary malicious URL disguised within the document's content. The presence of embedded links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=how+to+write+a+good+christmas+story PDF link annotation
    • http://nuxuzuruguli.mypressonline.com/sedapotizufij.pdfIn PDF document text
    • https://koxezapoj.weebly.com/uploads/1/3/4/3/134373248/befajofawaf.pdfIn PDF document text
    • http://zarumesa.mypressonline.com/68754906135.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/download_buku_pendidikan_agama_islam_kelas_12_kurikulum_2020.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/jider.pdfIn PDF document text
    • https://riveveketudoj.weebly.com/uploads/1/3/4/7/134706505/4772020.pdfIn PDF document text
    • https://tifavuloxu.weebly.com/uploads/1/3/0/7/130776439/2ea90173fd01.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/bb406c78-7d97-4ffe-8d56-78333be973b3/jusimoseritefuvukoko.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_58787cd57fd04718963208136cacc52b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5598bc-9d5d-4934-9d38-f73026756bcd/most_common_german_first_names_male.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c015a38e-d136-45c5-be44-2a433f9c3de5/goxejujalis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518ee322-5886-4fe8-9059-91cb173ec93b/fujifilm_finepix_s1800_price_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca579b4d-8b2d-48f4-95f6-a544366bc479/34231971353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94712832-e836-4833-9e62-0f0e5aa14b8d/98221377993.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_232f30f46ed34281b86c5ca3306ad1fc.pdf?index=trueIn PDF document text
    • http://xibiwoziveva.epizy.com/38379874687.pdfIn PDF document text
    • http://wokikeka.epizy.com/carcinoma_basocelular_diagnostico_diferencial.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_0727fb0e4c5b469092f59966ab33cfbe.pdf?index=trueIn PDF document text
    • http://daxevetefixidaj.epizy.com/what_does_a_layer_2_switch_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c57ce4-e8b9-4fae-94b6-e3a2e835a8a7/21601022174.pdfIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_f7e54518d02b4e88b3d6d2548d930a1c.pdf?index=trueIn PDF document text
    • http://lupipabibokaf.rf.gd/example_of_accounting_information_system_failure.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_5ffa6e6f723e42d2b823288a0f3f63d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc267eb4-399f-42e5-b79f-443901609d2e/graphic_novel_sandcastle_by_pierre_oscar_levy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac38ca3-db1b-4cf9-8273-bfffc1ce1269/can_microsoft_word_be_on_ipad.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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 5476 bytes
SHA-256: 08d5e6c980e4f0000fc1598b94f8a6a8d871254ee6486e2b53818bb38ddbce60
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 10436 bytes
SHA-256: d7f767ecc4cdea9a3ef20823a96cf3730f657045e7c2bec9bb5a600ee6989cd4