Malicious PDF — malware analysis report

Static analysis result for SHA-256 51775f871ec042cd…

MALICIOUS

PDF

68.7 KB Created: 2020-11-28 09:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: edf398e503754e0234c1f5776c3d772f SHA-1: e96f2cb328a68d19383ded6a67390fd61e3013cb SHA-256: 51775f871ec042cd85739728aeb626afcb3e182cb3f50aae716002e630e0f2b1
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 identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

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://trafftec.ru/aws?utm_term=small+business+job+description+template PDF link annotation
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/2054387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_5fb4c28fa5abf.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/wevixej.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/rijodapo_wijogisuk_mazowalaxegalu_gujidoma.pdfIn PDF document text
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/1374524.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/2826043.pdfIn PDF document text
    • https://vibikawezawu.weebly.com/uploads/1/3/4/7/134734059/1871f390b160.pdfIn PDF document text
    • https://fubapora.weebly.com/uploads/1/3/4/8/134897301/ee7dc130f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5f8d80d862f62.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/7291957.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/jiwisi/is_boiling_endothermic_or_exothermic.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/26726539906.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_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 5540 bytes
SHA-256: d684fbfb47852df390a093fcf76131811693f6a1bb4da09ef4dec1b3f8745b40
font_01_sfnt_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 10428 bytes
SHA-256: 95bb9e19191d8de230b7bac2033caa6912bbfca8350d7c143d8587b175dfa07b

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