Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac7923781a6bb73…

MALICIOUS

PDF

75.4 KB Created: 2021-02-14 04:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0273fabbc1677597fb550d2341635aa3 SHA-1: 45b7554d6ee559466b7ee3c15cf816fbb2563881 SHA-256: 7ac7923781a6bb7350709ef260d594cf31bdb169ef0ed7280feba992918e82ca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a high ML score indicates malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=moss+identification+guide+north+america PDF link annotation
    • http://naropiwazufilu.22web.org/rajafo.pdfIn PDF document text
    • https://suluxeposinugu.weebly.com/uploads/1/3/4/6/134634013/kubab-detoturozorixuv-wipijup.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/6007136.pdfIn PDF document text
    • http://runmasten.online/dezutesakxod2g.pdfIn PDF document text
    • https://mujaxelixoduren.weebly.com/uploads/1/3/3/9/133997177/pojutira.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/UoLAidN/98504818393.pdfIn PDF document text
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/1735326.pdfIn PDF document text
    • http://vizit.store/zaboboxibudaxemag8xq69.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/VgXhaic/62475005483.pdfIn PDF document text
    • http://mmmuuuue.space/42853613735mfkjt.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/ibSbgdN/flash_video_downloader_chrome_mobile.pdfIn PDF document text
    • http://mamimufexaliro.66ghz.com/get_bytes_from_bitmap_android.pdfIn PDF document text
    • https://jatakusikafe.weebly.com/uploads/1/3/0/7/130776866/jepeleser-lunujaxitu-zavaropofozugav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodupizul.epizy.com/ios_13_developer_beta_2.pdfIn PDF document text
    • http://ziwefegilow.rf.gd/converter_to_jpg_ilove.pdfIn PDF document text
    • http://tovujifemiga.rf.gd/believe_in_yourself_the_wiz.pdfIn PDF document text
    • http://gakowutegufez.rf.gd/introduction_to_marine_biogeochemistry_susan_libes.pdfIn PDF document text
    • http://borenuninod.epizy.com/92964959825.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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 5408 bytes
SHA-256: d538f3b526195a3e45b782e7b8e3adadbf6ee5f116edb202805cf79716baa551
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10660 bytes
SHA-256: b76baea447cc3d027d03ddf8b2c952d4ca486d69a37671b572d3cdbbda135233

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