Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdc9a150c651371…

MALICIOUS

PDF

98.2 KB Created: 2021-05-25 08:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ad8f6142137b4acedb74a6100c521fb8 SHA-1: e27564c93ed25c42d59184284cf3b2e56060aeb7 SHA-256: bfdc9a150c6513714736d046a9d93f1e3653a723d37bc0f9f62c695d860c7acc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, indicative of a link farm. The primary URL, 'https://gimoguvi.ru/strik?utm_term=tuberculosis+definition+quizlet', suggests a lure related to health information to drive traffic. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and potential malware hosting assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=tuberculosis+definition+quizlet PDF link annotation
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/a963328d96f09.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/633589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_605cf75c72c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_604cf4ff113dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6059e41d4feab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fcebe6c38161.pdfIn PDF document text
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/9970214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_60250d1b3b56d.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/4443cd14637c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_6038271f5689f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/86163890342.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/microsoft_word_2016_character_count.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/50263823129.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/52764123827.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://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5068 bytes
SHA-256: 1d07c7b22b6b11338e4bfaa799ca3fa98b33200a9a3c91404b12e1246ef8e661
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 38816 bytes
SHA-256: f93c5d2341dad0f712f050cac7f55f91a4f8d5980000f6287f58a694e3137835
font_02_sfnt_off000150d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D7 12624 bytes
SHA-256: b663d1cffa0761b382f9037975e2f12c8e63de153e9404298a2d6d23b3693b90

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