Malicious PDF — malware analysis report

Static analysis result for SHA-256 123f4a9fdcfedf0a…

MALICIOUS

PDF

82.2 KB Created: 2021-03-29 07:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 292cce38d65472232d94cb459880d318 SHA-1: 2a806e02143d0f1fc8df5c80ea2b1adad9721ac9 SHA-256: 123f4a9fdcfedf0a88a17b5c53128df946546e8016c2e46f8a4bd6c48cd46c3e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=project+management+functions+pdf PDF link annotation
    • http://lnstagram-helping-centre.com/mofosexogomw07k.pdfIn PDF document text
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/6620506.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/types_of_risk_in_international_business.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/dedorobevuie4qd.pdfIn PDF document text
    • https://zuzuvisaze.weebly.com/uploads/1/3/0/7/130738998/rotuk-xapemav-panamarodij-zerakuru.pdfIn PDF document text
    • https://bisulejejokix.weebly.com/uploads/1/3/4/0/134042342/sabowut.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/jadefatiw.pdfIn PDF document text
    • http://samettemiz.xyz/90269678528lirjh.pdfIn PDF document text
    • https://niwuxepajo.weebly.com/uploads/1/3/4/6/134669398/waxased.pdfIn PDF document text
    • http://pet-guru.shop/army_pt_circular_formation_commandsktltc.pdfIn PDF document text
    • http://potenciy.xyz/35452608105ygxxi.pdfIn PDF document text
    • http://help-business-media.com/jusazitq6627.pdfIn PDF document text
    • https://lodovanu.weebly.com/uploads/1/3/4/4/134403978/jupexut.pdfIn PDF document text
    • https://sewetupowak.weebly.com/uploads/1/3/5/9/135971958/jikemafuduja-ganalinosepoxuj.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/fitukalagivumanagorofog.pdfIn PDF document text
    • http://groshyk.site/balance_de_materia_y_energia_ejemplosqz298.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/karuf_vuxobekat_podixejaneweva_filatakusupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/skyscan_atomic_clock_manual_86715.pdfIn PDF document text
    • http://malejubu.myartsonline.com/to_be_simple_past_tense_exercises.pdfIn PDF document text
    • http://desigaweru.myartsonline.com/folalim.pdfIn PDF document text
    • http://pekiluji.atwebpages.com/synthesized_and_inherited_attributes.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_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 5520 bytes
SHA-256: 018d572cda5bdd668bec4a2ffbb6ab3b7162b70e230acb1736eecb9d7e60dc05
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 11092 bytes
SHA-256: af1169866d203ceb76fa2c3d85d67d5aadbeee55fc4ad2d575fc2d8106752a06

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