Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cff8f60ae554403…

MALICIOUS

PDF

75.9 KB Created: 2021-03-11 23:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 013ad2a1744441387a606ea8b4364fb2 SHA-1: 5a73950729d6ef5731b83611236275efc198c983 SHA-256: 4cff8f60ae554403b417380b44752a451ec479d13e2dd7a0646c4542c72971dd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=battery+tender+jump+starter+reviews PDF link annotation
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/sulepabowodawego.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/c3XeEmq/68548350375.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/1064518.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/abd80.pdfIn PDF document text
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/9d9a4c6c.pdfIn PDF document text
    • https://gedobelega.weebly.com/uploads/1/3/4/3/134375191/9249119.pdfIn PDF document text
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/xijobunudo.pdfIn PDF document text
    • https://nobozemesatib.weebly.com/uploads/1/3/0/8/130874372/aeccf.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/hiqigid/cut_the_rope_puzzle.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/djaP6id/perfect_world_mobile_quest_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_f0dc1ec2967c483c925535dcaab65a4e.pdf?index=trueIn PDF document text
    • http://moliposapivar.epizy.com/arcgis_10._6_tutorial_data.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_2f78b4966d4044199cb92f00f316a334.pdf?index=trueIn PDF document text
    • http://gumavefuve.rf.gd/mapazuxovinadiz.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_9a6b9d0d166a4e37a8b983cd971fdd01.pdf?index=trueIn PDF document text
    • http://dinixebun.epizy.com/dictionary_of_ancient_deities_download.pdfIn PDF document text
    • http://zaxowudupa.rf.gd/cancer_de_tiroides_papilar.pdfIn PDF document text
    • http://siwodonodefofo.epizy.com/chinese_language_app_for_android.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 5452 bytes
SHA-256: de1761ae37801c16c6a03bb744e73519cf7847d844610adce1a38b9672027734
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10604 bytes
SHA-256: 8d33db3bc47840591280bc0df308eb2160e2e93722ae5df708f1313d6540cfbd

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