Malicious PDF — malware analysis report

Static analysis result for SHA-256 536edfeb0b172297…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 14:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a08414d840405e0e9d4368a2584e7611 SHA-1: 22f075bcefa4ccb7dc7623906bb3eb15bcab99b9 SHA-256: 536edfeb0b1722975313f8d0774456f933730846df07a946c1610242342997ab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malware. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious nature. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/aws?utm_term=florence+scovel+shinn+libri+pdf+gratis PDF link annotation
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/kufifubiledu.pdfIn PDF document text
    • http://ferobuxanax.iblogger.org/lixisoramitavazuz.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/3de1cf96.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/6815335.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/quantitative_test_for_carbohydrates.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/tisinifezusowadaxupex.pdfIn PDF document text
    • https://rovoduwomu.weebly.com/uploads/1/3/5/3/135332400/momapifadanarefoju.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/sara_bareilles_gravity_free.pdfIn PDF document text
    • https://xabanovodo.weebly.com/uploads/1/3/0/7/130739860/wifotatajisug_baluzureravuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c233a731-96c8-40fe-86fd-1556990be0a5/zalagexufatonatis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6621fd-18dd-4333-b7aa-c48a2906f9c6/where_is_the_drain_pump_on_whirlpool_duet_washer.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_6a4d771fd3bf4808b1620aa17a4e8c5e.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_6b68f87940f9435daf9e7e50073932ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cbcb99-7fb6-4ba6-9d44-77ef47c65722/72863083449.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_f07f3ed6b82b4c4091db40b8239b4084.pdf?index=trueIn PDF document text
    • http://kexobub.rf.gd/mogibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1affc381-7e03-46e4-8f2c-82513e8816ba/15171918626.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_e363e726552d4c32bb79245d7de8f165.pdf?index=trueIn PDF document text
    • http://fefekug.rf.gd/my_way_frank_sinatra_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79d6d27-243e-40ae-b604-f32b99fdaf61/cual_es_la_importancia_de_la_matematica_financiera_en_la_vida_diaria.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_d82f21c26d514cfbb138c1ffeace8741.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d3e106-598e-45db-b527-09c730602a26/25360963193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189d48d9-7d44-4059-bf35-e72322f4ac3e/namubejumefosukiferejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159eba13-a220-4678-b346-fbec8139756c/88026747202.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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 5572 bytes
SHA-256: 68e12abfe2ee85e714bca0742726077a738fdfadfa31d4c7353211f6a4e5914c
font_01_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 11604 bytes
SHA-256: 6a2b61ca49e660464a90dd3bc8f42cebacaa9ca2736945af1fb557ec4180f889

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