Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bc1fa2ef844406…

MALICIOUS

PDF

77.2 KB Created: 2021-05-22 22:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 003d3512aec58006429c63197a60196b SHA-1: a6550c32351adcb2337c31f9d03e023719ff86a5 SHA-256: 38bc1fa2ef844406385fc34a92b1fe5c7c24ffe0926ead13017f15a65cc8f32c
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 cloud storage and external websites, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malicious content. No scripts were extracted, but the PDF structure itself facilitates the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xofujudafovebe.weebly.com/uploads/1/3/1/4/131410434/6655598.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_600e88979be1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_604b4712d0f47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_605323044cc09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fd307b92194b.pdfIn PDF document text
    • https://xaloxegapix.weebly.com/uploads/1/3/4/8/134862860/lutire.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/musazalezuxe.pdfIn PDF document text
    • https://zulovinivu.weebly.com/uploads/1/3/4/7/134758195/671799.pdfIn PDF document text
    • https://sarajigirokoxi.weebly.com/uploads/1/3/5/3/135300612/5328082.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/meripu.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/figazovak-rabolajujarilek-vevolo-kenikid.pdfIn PDF document text
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/1763313.pdfIn PDF document text
    • https://zikamesezelili.weebly.com/uploads/1/3/4/8/134857079/lojanusedaditiwiwisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_601861b3e5279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=how%20to%20use%20u8%20smartwatchPDF link annotation
    • https://s3.amazonaws.com/nazekisigiduz/watonujivuminoxuze.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/934553532.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/bafatedejotebijajozunupa.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/dezogetasosow.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/ginesevuzamorofup.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/zunamepi.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/8135569717.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/blackberry_z10_software_update_10._3._3.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/the_worst_mistake_in_the_history_of_the_human_race_main_idea.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/22796892388.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_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 5256 bytes
SHA-256: eac702af71c6b3f9aafa04ee79f31e365f7f49967a2f379c8bec79a27e289094
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 10588 bytes
SHA-256: d173bd973f49c3080cf943aa6d7feeec936fa77dab42a11059bb5ca363e138a4

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