Malicious PDF — malware analysis report

Static analysis result for SHA-256 58de2a67bebaa666…

MALICIOUS

PDF

76.8 KB Created: 2021-03-26 14:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f512b70b6eac741dc50da1704e8cb91a SHA-1: 190b2f1ed776912bf80e73d027d3763da5dc1818 SHA-256: 58de2a67bebaa6667f5c3b3d288638edfed78148f23aa820db422d59934b8caa
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 0.9993

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://jottigo.ru/123?utm_term=manualidades+faciles+para+regalar+a+un+amigo PDF link annotation
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/xukijagulav_datuxoxu_korusuwabukivof_lijuladero.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/dizen.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/pakuzezasevuraki.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/wapanetubonimasit.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/kenmore_microwave_light_bulb_underneath.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/bd75bae34828f.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/fulinafu-jazudusibevuk-fagiwuso.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/wejuki_mabosekob.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/b8006c207d9.pdfIn PDF document text
    • https://kiretadipul.weebly.com/uploads/1/3/4/0/134040802/tajugesenurenev-warigapuvuxa-zeroxe.pdfIn PDF document text
    • https://xitenewoz.weebly.com/uploads/1/3/4/3/134314294/1467242.pdfIn PDF document text
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/2993713.pdfIn PDF document text
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/32a9282adba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puloxivomavari.epizy.com/android_tv_bluetooth_remote_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4834cc-9477-4f3e-981d-e59f16f463e8/bilebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c840ea3-34ed-4401-8831-1ba8d0a0bb74/poulan_pro_snowblower_starting_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a3d47d-1925-4530-8bb9-529acd6191b7/visual_basic_6.0_for_beginners.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/81124572765.pdfIn PDF document text
    • http://jenamer.rf.gd/financial_accounting_exercises_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc1df88-6ae3-44fc-9fc7-6a7b147595b9/96836818332.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/pomaxazibatuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d542e2-761e-464f-b9fd-19db664c9304/74590786032.pdfIn PDF document text
    • http://baratak.rf.gd/kilofakasudasoteliwuxevej.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_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 5480 bytes
SHA-256: 70d7b30544a48a734b60d70b3c4ba24cbfad8eb46e4d136468aef8c8634057b4
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 11672 bytes
SHA-256: d0a149a91cc88ff5265b80edc68894063374f4c5a9ffc8ed5f095505ad2e2af4