Malicious PDF — malware analysis report

Static analysis result for SHA-256 809b0153ec2628b6…

MALICIOUS

PDF

87.4 KB Created: 2021-04-11 14:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7b8606f9fdd279d44b7a7c84c7711981 SHA-1: b0f13b2d516537609a4dfdc5e49f42ed7f74a095 SHA-256: 809b0153ec2628b62a4d84297663a529fa98e5cc3eaae2f39dcb97b0080ae552
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://gimoguvi.ru/strik?utm_term=pedaleira+firehawk+fx PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377704/normal_602a2b3710e99.pdfIn PDF document text
    • http://podonebatimekel.22web.org/fezonukeku.pdfIn PDF document text
    • http://busapibasin.mypressonline.com/adjustment_letter_sample.pdfIn PDF document text
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/2732976.pdfIn PDF document text
    • http://golepikoxeware.22web.org/tegogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_5fda2f3306443.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/burger_king_coupons_nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_6053b9840035c.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/76157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_602d7f805ecd1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimorem.epizy.com/career_in_commerce.pdfIn PDF document text
    • http://mepenaxuwijun.rf.gd/temenenakulunute.pdfIn PDF document text
    • http://tezotidugo.epizy.com/11th_std_biology_important_questions.pdfIn PDF document text
    • http://dizojid.rf.gd/gusixa.pdfIn PDF document text
    • http://xixovunutev.epizy.com/easy_origami_with_rectangular_paper.pdfIn PDF document text
    • http://nimezidudixo.epizy.com/kofiduzabivo.pdfIn PDF document text
    • http://bujazux.rf.gd/half-_yearly_economic_report_2019.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_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 5040 bytes
SHA-256: 262e090749bf80e2eb23f16e2107d47b30716d2ad4f58b4327cfcfdce1add514
font_02_sfnt_off000125e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 13584 bytes
SHA-256: 4de196624f036d7bc1aa0146e7877b96d83a9bbac1b03397564eae4f7f5e3099