Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae438157ba2ed728…

MALICIOUS

PDF

65.2 KB Created: 2021-01-11 10:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bfa055b40e1e8db0acefc99907e9296b SHA-1: 707b42e6ddb4a2304116089402d3a433fb25c868 SHA-256: ae438157ba2ed7280f5a1e8b3b419c14484c631ed101ad4fcfe6fa45f6fe37f8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external websites, many of which are hosted on Weebly and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it is likely used for phishing or distributing further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=codycross+answers+group+3+puzzle+1 In PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/c95a28e5c877.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/laxusolebab.pdfIn PDF document text
    • https://wuxavumitot.weebly.com/uploads/1/3/4/6/134683172/voturamiluluvivuwa.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/reboliduk-dekawid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd10968b1bae.pdfIn PDF document text
    • https://fupiloxeti.weebly.com/uploads/1/3/4/3/134380404/rapawuw-noveneguxidav-lisipujal.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/xanexebowudikivi.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/bipovoromoj/imei_change_apk_chamelephon.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/ritiku.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/jazibutudegaxitevifexej.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/oxford_picture_dictionary_english_arabic.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_off0000c053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC053 5608 bytes
SHA-256: 03354d0be86a2e4bd36050d4b1c30f8a1012e85cfdf5a15e66cccb719157774a
font_01_sfnt_off0000d39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 10700 bytes
SHA-256: 29cccbbf38bbf17a4c8d602e0e567387b174f1568f23fd936fc0a3fcf91ddcef

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