Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1c5b1fced440b8…

MALICIOUS

PDF

79.9 KB Created: 2021-03-24 16:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04e166a0746543722e4dfc49bf36711e SHA-1: fe2c9a608deb2cf71c9b566d7556b57dac766a22 SHA-256: bc1c5b1fced440b80ab60d51b945cfe8bf4b70e84c2e60f8ff2b6902ec61a184
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it is part of a link farm designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=topcon+magnet+field+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fd0927ec5a47.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/fedex_ground_bill_of_lading.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/talk_to_me_in_korean_workbook_review.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/2268048.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/56990442042.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/55680855238.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/122f4d8d-d8d8-49f3-a225-af6485acbabb/duxoforabuda.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/toxivumusudedejujujuxosin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cdf39a-4f9e-41f2-aa0b-9424dfb7479c/busifowifuw.pdfIn PDF document text
    • http://neketepa.myartsonline.com/26366702747.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/tevex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b7b025-3b86-4865-86c4-58ac6f2c3ae2/wokug.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/movies_counter_marathi_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb41f3c4-e05d-43e2-87d6-e2b9d4948a42/77996826391.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/organometallic_chemistry_and_catalysis_didier_astruc.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 3164 bytes
SHA-256: ac9cd10ee290e563123b158bb7df9a9ffad6eb4a6044f7fea8a802e85ad8d570
font_01_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 5152 bytes
SHA-256: d867981e10eb87de9be1a0a1856dfeb8c680ed6dad1bc7083eded865627440aa
font_02_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 11108 bytes
SHA-256: 91dbb445099c2200dc6bebfc1bb6e224188b94e60086f1ba4d2846696addea78
font_03_sfnt_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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