Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b33c903bfcc0aa…

MALICIOUS

PDF

78.9 KB Created: 2021-02-14 00:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fd7c4adf6686385a4cb25a3354915422 SHA-1: 28e33608c14846c37b2f4727642dd1ce1511faae SHA-256: 76b33c903bfcc0aa48cb258ca5ccb73596a56284eabb39c44e0f55d4f373a107
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of external links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation to drive traffic to malicious sites. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wb?keyword=how%20are%20glandular%20epithelium%20formed In PDF document text
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/5974897.pdfIn PDF document text
    • http://yourbigdick.space/52450008279guufl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_6000499b555a3.pdfIn PDF document text
    • http://springwin.space/56332623971tisol.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/b0a21d442407.pdfIn PDF document text
    • http://betmoy57.com/58014230336czull.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/kaxupebunisabux_temomomijezepi.pdfIn PDF document text
    • http://winoraama.space/glitter_tumbler_order_formx30he.pdfIn PDF document text
    • http://frasqen.online/judememamujusut8fej8.pdfIn PDF document text
    • http://zzzmmmmejjj.space/create_email_templates_for_gmailcccwa.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/jefilopaz-poxenesuvexas-gibegakujuto-tagodudumo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448341/normal_5fdd0ddb2e7ba.pdfIn PDF document text
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/1e91f2a451cdd0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jobavo/day_by_day_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/google_sheets_for_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 5212 bytes
SHA-256: 7365622a70bf9fd26712abec6cd3522286a7447cb72b880096ed13bcb9476c78
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 12484 bytes
SHA-256: b86864fa534474bbbf70db65022d8b4760f5f963e9f4586cb1f9c496840c4e99
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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