Malicious PDF — malware analysis report

Static analysis result for SHA-256 390edfb8c0ba087b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 05:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e7758da810b8f6ad6bc6a3433f768b01 SHA-1: 7f6e519188bc1a9830e84316196f46751069c581 SHA-256: 390edfb8c0ba087b0520e27f330afc7b6bdfa47683522c53f2545d93e7c044e0
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=traditional+catholic+jesse+tree+ornaments PDF link annotation
    • http://nigasheff.xyz/1315624829qd04c.pdfIn PDF document text
    • https://nakakikixug.weebly.com/uploads/1/3/4/4/134490848/818143f8d77a.pdfIn PDF document text
    • http://usesalle.xyz/gigasududibofajaliojeay.pdfIn PDF document text
    • https://remofixar.weebly.com/uploads/1/3/0/7/130776049/ab9c6202314.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/tafuju.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/39f9af4c5b.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/5c7a0284a.pdfIn PDF document text
    • http://edaruzal.xyz/leredogimikuxm6co4.pdfIn PDF document text
    • http://kawlites.online/pusaleteg7e6mh.pdfIn PDF document text
    • http://mixed-rootwork.com/42298830849zp4m9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_669de809d9e344b99602bb49df97c1ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/892b9f7c-eab4-419b-9589-a25b743fac1e/42396633304.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_d946a664bbda4d71a536bae6956a101f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebcb314-5edd-4703-b983-a3e888ee1b23/brother_lx-3125_bobbin_case_falling_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0775db4c-c93e-4250-9780-014909459d89/latimokegebupajigorex.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_9a9375243f8c4a3e8c0188e133b815ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/uttarakhand_flood_2013_information_in_marathi.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_6222edcb59ee4e0dbc06b9ba3872d262.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goneduzum/bajovexomotubawegoz.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_0be5348b6f5f458d9fd6a4ea59b623f7.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_cd985e87662e4576a3f7c21bd68e1e2d.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_f5087890d4984ab7a6788b347b99508a.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_82a95248d6e245e2a64ce9bdf9eb7ec0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d320d4-af77-4980-8d31-daaa5477204f/bukegodasinituvuzix.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_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 5204 bytes
SHA-256: be95e876d5e90e9b60643357e817fb2423e37e6944567bec73d067261eb8d11b
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 10892 bytes
SHA-256: eb8bdaf78413d02ef32391a28229050f4dc82618e32d834a8291eb8c99cb4dd6