Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ca1f1fbd91f7c0…

MALICIOUS

PDF

77.0 KB Created: 2021-02-12 05:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f4884272696565dc87a71845cab9483c SHA-1: 0153d723528156de12d797ae3ad098880b4f7d41 SHA-256: a7ca1f1fbd91f7c0bc0e732471dd118a4f538154f140aaecd4badf6f54c846eb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=arch+mortgage+insurance+guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401538/normal_5fedd646edc0e.pdfIn PDF document text
    • https://gagoduxo.weebly.com/uploads/1/3/1/4/131452981/100ae89f44f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450249/normal_600c8bd0c5add.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/ac6e9.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/01baeb.pdfIn PDF document text
    • https://zegiwamo.weebly.com/uploads/1/3/4/0/134018031/4137882.pdfIn PDF document text
    • https://zotolibufu.weebly.com/uploads/1/3/1/0/131069899/dufoxonowapi_jamaroxu_rovid_samugesap.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/zafowixo-kesabijap.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/ba540547944.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/bapenukepaz-nururuxig-sutonowifodeje-sakosamijaro.pdfIn PDF document text
    • https://xomugewobi.weebly.com/uploads/1/3/0/8/130814749/xizonu-nisukitibezaf-mupulesufipubos.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/3103760.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxutedi/wakufopamifebisefefe.pdfIn PDF document text
    • http://wabupotobexuxu.epizy.com/safety_first_grow_and_go_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/latex_cv_template_software_engineer.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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 5224 bytes
SHA-256: 9f4499ffbaf00aef97873e1938bf7fa6501cc3e8294896c523225bb88efe58c1
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10500 bytes
SHA-256: b5ffc6b3417e0f6b83226a11176619a42f2c7860cca6216b94faf78b105868e8
font_02_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.