Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf3c34cf6aafccd…

MALICIOUS

PDF

38.6 KB Created: 2020-11-06 21:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ef56322363c4675812c38e440371214f SHA-1: 3f6bd86486020d84a06c4b86ad15fa89c32e56ea SHA-256: 9bf3c34cf6aafccda4172d571a41e861142bdc36cad5746590cb9acae54f105a
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The document body contains a URL that appears to be a search query, and another URL points to a PDF hosted on AWS, which is likely the actual payload or lure. No scripts were extracted, but the presence of numerous external links indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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=desktop+wallpaper+aesthetic+hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449192/normal_5fa51ab1c1ecc.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/rovuweraja/wumasedarilololaweman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514bf89d-5e5c-4541-b400-c306f1aae5b0/fiwituxirimigijos.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/22185298003.pdfIn PDF document text
    • https://dusikoxi.files.wordpress.com/2020/11/34845633614.pdfIn PDF document text
    • https://radofet.files.wordpress.com/2020/11/rewunogasarusajuluviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e05ab2-6699-4774-929c-f0b144981712/pakanawunigumibovojilofa.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/kandungan_protein_ampas_tahu.pdfIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/48844646714.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/fnaf_2_office_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab67bae-1006-47f3-a71c-980ea41e406e/2612704162.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_off000058d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58D3 5316 bytes
SHA-256: a14f419f763e522b2b1b8785ecaa81f02caac09ba7d8b4a12b134cc76f4be161
font_01_sfnt_off00006af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF8 10252 bytes
SHA-256: 662470118a63b580f9a0b4a2e188fe651e43dd2d927522443f19c29f695df001