Malicious PDF — malware analysis report

Static analysis result for SHA-256 611d350d588d630c…

MALICIOUS

PDF

76.8 KB Created: 2021-02-04 13:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fe89a8540c77708666c57fe762fdbeff SHA-1: 9a4137a24402f2af74cff74406577de65c137415 SHA-256: 611d350d588d630c06016d0cc712179fac11844b32c552b28ca8d572a0fdfb26
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 are disguised as book titles, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to trick users into navigating to potentially harmful websites.

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://baarspo.ru/123?utm_term=shigley%2527s+mechanical+engineering+design+11th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5fefd1a9b0afe.pdfIn PDF document text
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/7810fa8daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6016ba8348413.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/bECMjaQ/electron_configuration_of_calcium_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378386/normal_600296d32351b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6012aa16cb495.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/Sjbhj4o/87716812585.pdfIn PDF document text
    • https://cdn.sqhk.co/wovedajuraki/gdieSgd/30453616046.pdfIn PDF document text
    • http://idealicaufficiale.website/convert_scanned_to_word_free_online43981.pdfIn PDF document text
    • http://lasns.fun/komumixebuzifatojilupikov0vyn.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/RnGih8l/best_potential_wonderkids_fifa_19.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/iijb6V5/meniputavafo.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/haigigd/need_for_speedtm_no_limits_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/MuqVgdi/geziluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fd1312947d00.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/xanunafojuloki/36726267827.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/chuunibyou_movie_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/c_major_scale_piano_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/central_dogma_worksheet_doc.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 5644 bytes
SHA-256: ada9779b74dba34c2e2790b7bdae5320e1dfbf68229868ece4da7860f52961f0
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 10632 bytes
SHA-256: e33efd49f58581df78b86b82fa169a6b564f005844ed7b9eba1b1a0a3595f56c

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