Malicious PDF — malware analysis report

Static analysis result for SHA-256 155ddd0e134cc42a…

MALICIOUS

PDF

70.0 KB Created: 2020-11-17 15:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1bd94f7a2259ef449a47a23b6bac2c8 SHA-1: 15b80764e3a868e7f6edfbb24802477a7b0d8311 SHA-256: 155ddd0e134cc42a20066f6db723c2bd0c3200d22604d4dbe306e3f9774305a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=enhanced+lccap+guidebook+3
    • https://fozumazajafipal.weebly.com/uploads/1/3/4/5/134588547/kozupizokipiji.pdf
    • https://mamotuzukaw.weebly.com/uploads/1/3/4/4/134438076/7846475.pdf
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/zonekagififeb_denules.pdf
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f9548648ae32.pdf
    • https://lafumunokude.weebly.com/uploads/1/3/4/6/134666321/27fef2ab98c02.pdf
    • https://taxepenobeg.weebly.com/uploads/1/3/4/3/134355702/faxepinenu_labato_xomomex.pdf
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5fa703608e247.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kopisigapub/rutam.pdf
    • https://s3.amazonaws.com/wanalovum/glycosylated_haemoglobin_report.pdf
    • https://s3.amazonaws.com/zirojopemup/takegupa.pdf
    • https://uploads.strikinglycdn.com/files/f72d647e-3fad-4245-a09c-383a22b90aa1/gelixarovexo.pdf
    • https://s3.amazonaws.com/tetazino/93719508714.pdf
    • https://uploads.strikinglycdn.com/files/e735ca30-ec47-40ea-bc3d-bbc4d4298de5/54154050317.pdf
    • https://s3.amazonaws.com/goneduzum/daremevibiwuga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d258.bin
94da2a1d0243e12b458ae932b209c9495cbdb7b6475e26dfc8af68e12dc7a64a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 5388 bytes
font_01_sfnt_off0000e4a8.bin
8c76cd2738185e3eedb04eb61d476bfbd0012ca746e1000288fcf5345197be1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 11936 bytes