Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4aedeb149c1768…

MALICIOUS

PDF

87.0 KB Created: 2021-03-19 05:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88528a0c5c97d23bc5998b65b6553e96 SHA-1: 615be9123eb4b3e6540ba94b6bbcbde8bc4375d0 SHA-256: 5f4aedeb149c17681c9569b0ccd15f34f0cfa236701afb388d804321ff817830
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The PDF contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or redirect users to malicious sites. One prominent external URI, 'https://vilenefex.ru/wix?keyword=old+rival+crock+pot+manual', suggests a lure to disguise the malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/wix?keyword=old+rival+crock+pot+manual
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60100f972b8f8.pdf
    • https://cdn-cms.f-static.net/uploads/4385635/normal_6038541b05972.pdf
    • https://cdn-cms.f-static.net/uploads/4411916/normal_600c45b9a26bd.pdf
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5ffae7a6176dd.pdf
    • https://cdn.sqhk.co/pijajawopoji/jejjjjI/funny_tik_tok_video_2020_download.pdf
    • https://cdn.sqhk.co/raxoxawupej/ihfWKd9/nudulaxurizevoroxeneji.pdf
    • https://cdn.sqhk.co/zugivakizo/Khbhgjh/88097122064.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/652e9803-627f-416b-8850-394c198a33a6/wild_game_camera_sd_card.pdf
    • https://uploads.strikinglycdn.com/files/5d08f7a2-3c18-4743-9493-5851af62f338/nijuxa.pdf
    • https://s3.amazonaws.com/fapaga/79205631717.pdf
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_7ad6f12e2f2641ef9009a4f730596b0c.pdf?index=true
    • https://s3.amazonaws.com/gurupixabogivaz/zavawotosatidafelu.pdf
    • https://f94e9843-a566-43a2-b889-c50604c3b963.filesusr.com/ugd/f64db8_f17c5fccc2d14fc2bbdb697337e6ba43.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/68106939099.pdf
    • https://s3.amazonaws.com/pozokimepe/75770454284.pdf
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_a2f1d4fea5ef4465afe0bf7d1dfe7dfe.pdf?index=true
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_47719a01c204406589a7be70039031f7.pdf?index=true
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_3afcf7c4e45345c6a318c98285f5c182.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c3c989d2-4b5a-46b7-a6d9-0f6bbdfc5b27/99017592255.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_6f0bc66f4bef43398de4245232d20072.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b876c98-0c34-48cc-b4ab-60b5ca93c90a/what_are_the_5_different_love_languages_quiz.pdf
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_d761174e87414f21a33d8177b91bb509.pdf?index=true
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_5be137d470204ab3871b85b3da8d0ee1.pdf?index=true
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_676a5cb518944f61bccd226183788e37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50112d39-8c28-439e-b1f9-6111363eb004/xeputuvizojerafepukugolut.pdf
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_b246fae323d94f298bd3666b4c4fdaa5.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a5.bin
bae6b58a1c5eb5b4cbfa94da514f919be3d1a98d3a92c67ff5b50f2b95c165af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 5192 bytes
font_01_sfnt_off0001293f.bin
82702df595202627b7b01fcb006c78d4625b38069ac785b0cf74271c41a01a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 10812 bytes

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