Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a20d8f3b0cf646…

MALICIOUS

PDF

76.4 KB Created: 2021-03-06 07:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9338f6500183cb2cd17f16f24c0a9af SHA-1: 428716f5c6ed036733674f4c98994a1b5f2e4217 SHA-256: 43a20d8f3b0cf64671c34cb123ddf9853ce2efea615e60d21a08ea5309dc32f1
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document, likely used for phishing or distributing further malware.

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://ponafet.ru/123?utm_term=todos+los+conectores+en+espa%25C3%25B1ol+pdf
    • http://zudumawekal.22web.org/94164810799.pdf
    • https://mirurilusenut.weebly.com/uploads/1/3/4/6/134631679/lewolinaxejajakur.pdf
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/ae2e9fa69a9158.pdf
    • http://xudeduda.iblogger.org/java_8_211_64_bit.pdf
    • https://dajixogemozuv.weebly.com/uploads/1/3/1/4/131438707/rometizog_tejawimuloropo_zunij_xizib.pdf
    • http://pewadulojuba.mypressonline.com/what_is_the_purpose_of_guidance_office.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_2c27f3cf92e14205898b90a7ff99db46.pdf?index=true
    • https://uploads.strikinglycdn.com/files/62d96e8e-06c1-4885-9ebf-79f34688bd3c/what_is_the_most_popular_songs_2020.pdf
    • https://uploads.strikinglycdn.com/files/3e15b506-3e6a-4909-a88b-7b404c19fa20/the_art_of_seduction_robert_greene_audiobook.pdf
    • http://wozaloruwogilo.rf.gd/23373172045.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a04483b8d3df483eb44447aba9ca9510.pdf?index=true
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_d8682126e7b9464cbbb3165fd76d5019.pdf?index=true
    • http://kozogasivufi.myartsonline.com/67793581553.pdf
    • https://uploads.strikinglycdn.com/files/70d16198-ec9d-4f8e-997e-27950b857da8/tiredodadubalanumemijep.pdf
    • http://govakuvi.epizy.com/blackbird_beatles_guitar_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/38c8601c-7f2a-41df-b3de-cb3183c475f4/mapadawoteruz.pdf
    • http://dizoran.epizy.com/sample_special_interrogatories_california_personal_injury.pdf
    • https://uploads.strikinglycdn.com/files/9fae0785-c883-40dc-930d-7e002def1753/map_of_hell_by_sandro_botticelli_location.pdf
    • http://pexoroxijaseduj.rf.gd/men_s_shoe_style_guide.pdf
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ea2360725a1e4657bead5fa4813ea173.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd85.bin
3423d17d8be31fa457106828ea9bb5942f35ec4cc491aa57d48ef70df8c4d421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 5052 bytes
font_01_sfnt_off0000ee74.bin
345b16ccae0ba5b2aef16a66ba5870cd8799e71c57d790df585575e1d2dc1671		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 11656 bytes
font_02_sfnt_off00011410.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 4324 bytes

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