Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7473d0cdbd7a474…

MALICIOUS

PDF

83.3 KB Created: 2021-02-27 16:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fb80b9b706e4ca88cc945e94d6717c9e SHA-1: c63f92545dea49eb2952fe66956e1d4b5a609370 SHA-256: a7473d0cdbd7a474f4bbb34a9486c006c526e69f8be3526a031e47214d6101af
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, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. This suggests the primary purpose is to drive traffic to other sites, potentially for SEO manipulation or to host phishing content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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://bologen.ru/strik?utm_term=are+nesco+dehydrator+dishwasher+safe PDF link annotation
    • http://lipejilun.iblogger.org/suwojusiwabazazunelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_601f4226c0886.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/36893269875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6015abb488dd0.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/farel.pdfIn PDF document text
    • http://sezituza.66ghz.com/free_holiday_templates_for_flyers.pdfIn PDF document text
    • https://lafefozusut.weebly.com/uploads/1/3/4/5/134597047/wigogasa.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/fevobelijogal/41340945304.pdfIn PDF document text
    • http://genoropafetado.epizy.com/34187647729.pdfIn PDF document text
    • http://towawemigegi.epizy.com/pibamujuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/gikerazedujewizegusikop.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/magazine_fonts_free_for_photoshop.pdfIn PDF document text
    • http://degivenumi.epizy.com/casual_semi_formal_dress_code.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/cara_di_academia_tanpa_login.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_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 5260 bytes
SHA-256: 187b89b7c23fb806946e14884aaec6bcfdc558d5f40d40742fb63682db15bd26
font_01_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 10900 bytes
SHA-256: ef78f63f71d8ba38e9a11435e85125fb90b6e7969105a25644552f84294f6f67

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