Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7c70998c86ea24…

MALICIOUS

PDF

81.3 KB Created: 2021-04-02 23:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 19157995468904f84f89e8ba20581236 SHA-1: cf40290717f0126226232654e6b9352e54ee0a48 SHA-256: 7d7c70998c86ea24d386c6742d5e3354a92452d0c42ed57f47af2d20bdb72b50
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded document body text is corrupted, but the presence of numerous external URIs points towards an attempt to redirect users to potentially harmful websites.

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://seumenha.ru/wix?keyword=sample+letter+of+recommendation+for+student+volunteer+work PDF link annotation
    • https://lidukawovov.weebly.com/uploads/1/3/5/3/135323160/wikonol_pexijusupan_dowokananawesa_sozoxaxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_605f75e41408b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_600f53b4e5078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_60304d3ee9f56.pdfIn PDF document text
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/gufojuziketuzureri.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/naburas.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/5f2aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_60287d450feb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5fea3487e41e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407062/normal_5ff4c4cc6bf0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepalufozakot.epizy.com/keto_diet_menu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/zuxaxedorov.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/wediwirosubowiwijax.pdfIn PDF document text
    • http://sesunofopum.epizy.com/los_ojos_verdes_gustavo_adolfo_becquer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7903325-0551-429f-aa72-4f4b2f81b0f4/the_animators_survival_kit_richard_e._williams.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/solve_quadratic_equation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31291b78-18fc-4d93-ab9e-162d5ce55f96/best_speakers_for_audio_technica_lp60.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/jemoliwamulile.pdfIn PDF document text
    • http://refitebi.epizy.com/blur_pics_hd.pdfIn PDF document text
    • http://kesekerezox.epizy.com/acronis_true_image_2020_iso.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_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 5620 bytes
SHA-256: 88bd39373a061a8528d16479bd8e3e4cdcc88f37d6c841b5492d73edfa659c65
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 11012 bytes
SHA-256: e4739e04b50354469b0068ecdd3f332be1bf966a153e68c445c0b9ed0f10e1e9

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