Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8f970e35db87e0…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 16:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fa31a6706143d93e2f33ee846d4938eb SHA-1: 23af694ba634bc83cf304c9a8549efbf6c9a35fd SHA-256: 7d8f970e35db87e02532ac8f277f745b59d43143e34a8e425a06379a5d4f9b97
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, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary attack pattern involves directing users to external resources via these links.

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://nipisod.ru/strik?utm_term=seven+values+of+lakota+life PDF link annotation
    • http://jugapus.sportsontheweb.net/around_the_world_in_eighty_days_book.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/4912088.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/slang_words_examples.pdfIn PDF document text
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/bugax.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/7b71e9cb-7542-4c45-b606-f8ce7a42f757/public_relations_specialist_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f341638-f4b0-4db8-b978-24195421e02e/history_of_the_united_states_documentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3dffcd-d6ad-4807-a48d-453f4697b31e/43213800556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15125534-17fe-45ea-9840-da3a60b1b0bd/what_does_the_yellow_circle_with_a_star_mean_on_snapchat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4763f26-4c66-423f-abb2-7c4bd3c1d73e/vonofokifonabazadiwi.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_548b778181f74193bfcbbeb663a00641.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_fcd7fad534804a408a0c0b2e490afcf0.pdf?index=trueIn PDF document text
    • http://salajire.onlinewebshop.net/2nd_law_of_thermodynamics_notes.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_a04f316942074af09a98f2e0a3990c00.pdf?index=trueIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_c8b60a00bc9c4c76a7978dc2ae90100d.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_ebe33ad3e847445e8c8f61862e85f7b1.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_e731ce004c3c41fcad395e643dc561b3.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_7f3827cd8df04ab0b4d82bd44ff209f3.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_380130fc18c3455284d709801d895695.pdf?index=trueIn 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_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 4892 bytes
SHA-256: ae178ce244e52cd77cacd19c2397cb9dac22952c149a29d97a0feb61e150fc8e
font_01_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 10648 bytes
SHA-256: 981acd4d85214a19c2bdb7261d374208de8e5b4a23b8afe1d455f15fd775a219