Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc5c9785b7ff1e8…

MALICIOUS

PDF

81.1 KB Created: 2021-02-28 14:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8d2f484ffa781f94ede96f2edfc02165 SHA-1: 9483cccd7d42c01388108accc5f72d0ea24257b4 SHA-256: adc5c9785b7ff1e854d0368ccb40646be480c571b3cbc265b40693e1412f5c35
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a redirector link and a large number of external PDF links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or phishing pages.

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://yafferge.ru/wix?keyword=onkyo+tx-nr525+review In PDF document text
    • https://cdn.sqhk.co/mobovogoneja/jjLgekc/most_beautiful_wallpapers_for_mobile.pdfIn PDF document text
    • http://igcopyrightclient.com/lapusejojipewipcrc2k.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/nevosisuji.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/b38Aw2W/e_coli_outbreak.pdfIn PDF document text
    • http://fresh-ita.fun/show_back_button_in_actionbar_androidun7yx.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/uU4Kujh/vivodedikafimixeze.pdfIn PDF document text
    • https://rusajilema.weebly.com/uploads/1/3/4/8/134853265/1718283.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/miwinotujuzitadubi.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/37601682279.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/4071040.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/ghVijie/throne_of_glass_characters.pdfIn PDF document text
    • https://wagetuve.weebly.com/uploads/1/3/5/3/135323282/333e761a68b6a.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/JidPFhW/tumblr_quotes_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/dutigimomana/2ia6gfI/31035623726.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/a75gfh7/connecticut_national_and_state_parks_in_florida.pdfIn PDF document text
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/mamomu-tebadabofajuse.pdfIn PDF document text
    • http://samozanyat.info/apartment_guidelines_nswd8wja.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/mavivekepikusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavamikilav.myartsonline.com/fetonowesafoperozefado.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_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 4960 bytes
SHA-256: 140229bb1f08129507463890b202d71e89ec9e540cfddb5534ded6d64fe82f27
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 10676 bytes
SHA-256: d813739b6ccf9defee284bc7e16ef462f6f17ada58a82c5eb42a89e3163a1040

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