Malicious PDF — malware analysis report

Static analysis result for SHA-256 7974bd88312c7272…

MALICIOUS

PDF

97.1 KB Created: 2021-04-09 23:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcb0523e0494b774c566944e30569dad SHA-1: 20b27d68dcd0115beafc024dbe2da2446123ea6e SHA-256: 7974bd88312c72720291b0cd4a2092476380345f5a67324b0a0147618cf1a147
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a link farm designed to distribute PDF files. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=3+and+4+times+table+practice+sheets
    • http://muzibatixabu.mypressonline.com/85387083431.pdf
    • http://kerutugizuxig.mygamesonline.org/how_true_is_into_the_wild_movie.pdf
    • http://navevukosuso.mypressonline.com/74636796328.pdf
    • http://waverufusufafuv.scienceontheweb.net/bidutalawuge.pdf
    • http://nusowutevu.getenjoyment.net/tomoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tesotiwapax/58988711761.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_82a95248d6e245e2a64ce9bdf9eb7ec0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6c8bc7db-bfa3-43f2-aa54-574c78f4d1fe/fifty_shades_freed_full_movie_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/da069186-2de2-4317-a3d0-f7de2d2c0ef2/common_integrals_of_trig_functions.pdf
    • https://s3.amazonaws.com/rodigapigeta/30_durometer_silicone_sheet.pdf
    • https://uploads.strikinglycdn.com/files/539407e8-5d45-4def-9787-02693646de5c/what_power_would_i_have_in_the_darkest_minds.pdf
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_384713541493413b84d2b079125cb100.pdf?index=true
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_a2bb7b003a9a440b8fb2cd9ad32d5be1.pdf?index=true
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_402cfb09eb5048668247cefcd188266b.pdf?index=true
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_a54d363eb40c483a99a709359dc16e45.pdf?index=true
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_73a78a8579004a1bb672058ed2efc09b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b1009a70-1f5c-45a6-bbfd-52b2dcb807e1/2005_dixie_chopper_silver_eagle_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/f267ed6d-a498-4a28-beda-fb9e8608f2fd/gakowomegujatitojorur.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_5077de41b688493eb3344e8eaa492ea6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b70b66b-36f7-4494-9183-d4064964852a/80300122494.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fc7.bin
d4485a05e9b8c70b7ac01009f2d37ce83b20897e06ab190bd67fb73fa417b93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 5288 bytes
font_01_sfnt_off0001417b.bin
b61924063cc9dbb824a3b26501765e20bf063f61c368d43914ac1d5c6aec1ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1417B 11168 bytes
font_02_sfnt_off00016731.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16731 4324 bytes

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