Malicious PDF — malware analysis report

Static analysis result for SHA-256 5820f1b6fee57181…

MALICIOUS

PDF

63.3 KB Created: 2020-11-09 20:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6ca16ca073c1a0f55383b8497dfb260d SHA-1: b8bfe3ce9545fef42a0b87e536392cd91a79dec0 SHA-256: 5820f1b6fee57181d95f57632c846f0c8a6ecfa95c7ffed5a72e3d0c5e81d927
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 of which point to PDFs hosted on various platforms, suggesting a link farm or redirection scheme. The primary external URI, 'https://trafficel.ru/aws?keyword=the+wright+brothers+at+kitty+hawk+book', is likely a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?keyword=the+wright+brothers+at+kitty+hawk+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fa1726f25c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5f8f8491ea8ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5f94848cbc429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5f990e76adea8.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/d03ee33.pdfIn PDF document text
    • https://repavubujog.weebly.com/uploads/1/3/4/4/134486674/6321540.pdfIn PDF document text
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/79098b7f6c2f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f9cd0372ebf3.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/wipotegadodorek/nivawivuderuwavinikulaki.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/patanjali_ayurveda_books.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/logiwut.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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 4944 bytes
SHA-256: 14b110def9dac989ed79d1b7be932ba21c6833e4d347dba8dee424f3585c6fc9
font_01_sfnt_off0000c0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A7 9904 bytes
SHA-256: dc23166701f228302289b72fd18beccf66d97b162b4e5539220cb5e32116594d
font_02_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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