Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d79de18cc9e1cf…

MALICIOUS

PDF

67.9 KB Created: 2020-11-27 09:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8f09e9a87c28dd2104227e3043e5f16c SHA-1: 7c12a53cb3a3722463f84c00825aa4fd08ff68ed SHA-256: f6d79de18cc9e1cf505ec65061a7ef50eb09820411cd2bfd625cf29225f821c6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with 'https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/jejudebux_farogajoza_paxup.pdf' being the first identified. The presence of embedded URLs, such as 'https://trafficel.ru/aws?utm_term=blue+eyes+baby+photo', further supports the attack pattern of directing users to external resources. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic imply an attempt to manipulate search engine results or lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=blue+eyes+baby+photo PDF link annotation
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/jejudebux_farogajoza_paxup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa022c388582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f8d9f6e71760.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/wedetujopag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fb32c43c9570.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/pazifetanegapu/91734403928.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/73384691147.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/catalogo_hinode_ciclo_2_2018_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36b476b-2a56-4e04-aab1-5dc7c7edccc1/sasev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956b1bd8-d353-454d-bc06-b431be554d97/mumor.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/68016775306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5780466c-634c-461d-ae39-54e0edc093b4/wapobaj.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/auto_start_app_android_pie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74696e9f-085c-476d-84f2-f05864a69901/noverajafoletikuzenexafa.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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 5100 bytes
SHA-256: e806de1250bb5c9075526b6764687be30eec12dab27eab898001a3f376853f6c
font_01_sfnt_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 10456 bytes
SHA-256: 9b3325f7c9c03d476b63a6411f1ce95c01adb84582d45bdc12040a5691155cb6

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