Malicious PDF — malware analysis report

Static analysis result for SHA-256 19171cf7aa152f5a…

MALICIOUS

PDF

76.8 KB Created: 2021-05-30 05:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9c30ba41b4a2f3d04c06879aaff222d2 SHA-1: de9ee740f2f646a7f77d135e74d11b64329fd570 SHA-256: 19171cf7aa152f5a13dd477697c6ea26d2d8b6230ca152d396f04d0ee0e7ef68
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. The primary URL identified is 'https://leonvi.ru/123?utm_term=akshara+audio+song', and a significant number of other PDF links were found, suggesting a phishing or content-farming operation. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=akshara+audio+song PDF link annotation
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/monevixumuvufegebubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_603352a361dd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449777/normal_5feebe73af385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_6065f5456b07c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5fe4f4dc09270.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/jukegekefijilebav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_60282b1fed833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_60555f3e4efda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fddae76208a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_606351d7f0a7c.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/bupevu-vumaxama-mosutiximelaj-xijejego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20f57a3-a3b3-43d4-9362-744919ecf707/flowers_for_algernon_short_story_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e4bd14-e877-4a90-a5ff-67b42d5a659c/66069723197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68a9556-8e41-4e44-b2af-7e084380b5d8/pafomupovabakikib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1604917c-0f31-4abd-ac51-ba1d3eac67fe/21526679294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990a3ac5-7e25-45bb-b4ad-ecbe63971083/nespresso_promo_code_uk_april_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fe6c01-3b14-435e-a3a8-a299b5844620/exercices_cm1_les_fractions_simples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9feaf4fc-5bfe-4b39-8e44-4192f63d6073/26620848563.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 5108 bytes
SHA-256: e317542153652c56e815abc875692025267d35bdbcf716ca42182a525842761a
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 10980 bytes
SHA-256: b230c3e7943eced939eb46d3dad5aa9c8fb00f47453d95db4eac586b29f3d8fd
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 3220 bytes
SHA-256: 5de051c4e33c0e5021281055a2ac012158867aba78a90763ca49546e021066c1

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