Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ed1f4dd616b146…

MALICIOUS

PDF

81.9 KB Created: 2021-03-21 03:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a15a7d0a1a9338482540fa54ae51fd94 SHA-1: ceec0c17e728d8169436e3b17aea7fd8e7ade96b SHA-256: 43ed1f4dd616b14670e818d14fafea31475c3a33fc38bb326a037a4711522cee
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. One of the embedded URLs, 'https://dugedepap.ru/wix?keyword=sat+exam+dates+2020+fees+in+india', suggests a lure related to exam dates, potentially to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/wix?keyword=sat+exam+dates+2020+fees+in+india PDF link annotation
    • https://zozufawagizawag.weebly.com/uploads/1/3/4/4/134454621/e071c7ce68a.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/2729049.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/ejg2hht/actor_vijay_songs_isaimini.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/9964687.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/870266.pdfIn PDF document text
    • http://satopek.iblogger.org/lofaxasafigagobew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_602e521ee86ae.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/hJdigjg/cops_and_robbers_map_minecraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_600c708e92eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_602b07676d6d7.pdfIn PDF document text
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/3834115.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/ralujif.pdfIn PDF document text
    • https://tafivemusuwivik.weebly.com/uploads/1/3/5/3/135322605/wumowepokodorik-fejewuboweso-zogowuvidomele.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/2997396.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/hGWI6Ga/39620414622.pdfIn PDF document text
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/5ac4f613a6.pdfIn PDF document text
    • https://zitadinenere.weebly.com/uploads/1/3/1/8/131871439/kunox_fofev.pdfIn PDF document text
    • https://sipinawuzukefo.weebly.com/uploads/1/3/1/4/131410227/5324244.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/2786379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokupila.rf.gd/sivewomarobugujeza.pdfIn PDF document text
    • http://fifumuwun.epizy.com/tefubimifosopuxegujite.pdfIn PDF document text
    • http://zaragodevin.rf.gd/law_on_obligations_and_contracts_sample_cases.pdfIn PDF document text
    • http://sovutenagora.rf.gd/apa_style_guide_2020.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_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 5372 bytes
SHA-256: 84c3e3c81bc3a4a5face955b8c4e5e0bb4f951a027b90078815d1bb5d72c5ff4
font_01_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 11248 bytes
SHA-256: da19d0bebc3d92cba10e89b896df54a482207f8edcaef5133416237426148d36