Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53d9c09b6ab56a2…

MALICIOUS

PDF

71.0 KB Created: 2021-01-27 17:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 242b6913baf25b082708bb6c2bd1922d SHA-1: 72f23022b658018e9c15f3593942179994c1a9e5 SHA-256: b53d9c09b6ab56a2f03d8cbee2a09f797ed48147d49f8f78e97a8bd4ea824564
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links, and the presence of an external URI pointing to 'baarspo.ru' indicates an attempt to redirect the user to a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=things+that+start+with+m+for+preschool PDF link annotation
    • https://sukorajonivo.weebly.com/uploads/1/3/4/1/134108587/8835097.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/zurodikawavit-zupijejisil-ragufofebalit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491155/normal_5fdd5d544f9a7.pdfIn PDF document text
    • https://podozipejubepa.weebly.com/uploads/1/3/4/8/134893890/daf41644b3021a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5ffcc4218e0ed.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/ab924dc.pdfIn PDF document text
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/3060477.pdfIn PDF document text
    • http://baranaydin.org/zifefutuzitib2uxuv.pdfIn PDF document text
    • http://gufutaca1.xyz/68131111049jgims.pdfIn PDF document text
    • http://realnoe-obshenie.online/50_in_1947_value_nowr3pan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5fe02b7124dac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5fe18bcd2a9bd.pdfIn PDF document text
    • https://bofuvozera.weebly.com/uploads/1/3/5/3/135331850/zilogi.pdfIn PDF document text
    • http://ijmalan.xyz/distance_measuring_using_laserfr3wi.pdfIn PDF document text
    • https://fasexunatosupa.weebly.com/uploads/1/3/1/6/131606354/sarogiditirax.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/babetafaperaxov/79133307617.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/7398859343.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/kaxoxinipodedarebi.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/87648340445.pdfIn PDF document text
    • http://zilomit.epizy.com/55057117180.pdfIn PDF document text
    • http://vopuxoke.epizy.com/watukuvojalawubonetul.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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 5468 bytes
SHA-256: 6bfa64a2546d42a37319c2e5c8202d3ab3626d532b1b1df4f9bb438926ae5115
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10176 bytes
SHA-256: 146694d3158d285aa9cec52738c5cb3b32ea42221ae40a9d9204058f0d0b17fb

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