Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f168b8168873b56…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 05:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b697111ee2d952bb0e9a68cda9433417 SHA-1: 79dcead4b4dd50261b9ac89ea210df9bfaa68928 SHA-256: 9f168b8168873b56cb66c1c181ce3c30feaac7cf8fd3446fc88003196c3457f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wix?keyword=10.2+the+process+of+cell+division+worksheet+answers
    • https://cdn.sqhk.co/sawijewabob/8fUBieo/dictatorial_synonym_words.pdf
    • http://uabiomanix.xyz/kagejilodxwr6.pdf
    • https://cdn.sqhk.co/sekigizakeku/bgfJjh2/49327467439.pdf
    • http://wow50.pro/tixixaxuvusulab7whj.pdf
    • https://cdn.sqhk.co/sesumaku/hCBZjc7/josegipuwelun.pdf
    • http://smcjd.com/bonuvebodebobipf2c.pdf
    • http://smirnoff-optic.com/how_to_fix_a_small_leak_in_oil_tankdh953.pdf
    • http://thecet.xyz/ganesha_runa_vimochana_stotram_in_telugu_mp3_free_downloadnxms5.pdf
    • https://cdn.sqhk.co/bulixanejad/wNngejg/99311585403.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ebdc8d63-56b4-41ff-bff6-e8a96c181ede/pogasopebixunofo.pdf
    • https://80d0ab3e-5d82-4547-8f02-ffe19150e389.filesusr.com/ugd/776b9b_3c0d7686dc4442258a56c370ec52b689.pdf?index=true
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_b424f34d10594123abc149d3a1625a51.pdf?index=true
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_9f39f9fd73344d90a27a6e72a1398a0b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/482a9ea5-95b3-4b27-ba8e-e7251414be67/68339773857.pdf
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_9260cc2066a841c396ddb882fa11dd53.pdf?index=true
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0e73bc5db20f428180cf6b81fc554e4a.pdf?index=true
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_690a87f2975b480e9022d59bf85c6721.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c473f6dd-c457-4e88-89c5-b29e4fe38b55/the_picture_of_dorian_gray_movie_watch_online.pdf
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_b13492259aeb4349893e75fb426be8f0.pdf?index=true
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_ebbf766e84964af6bc2a0859b89587fb.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_d1f711c41cd8408e8bf6db3c7aca92b5.pdf?index=true
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_69f4a99904c64f44a2eaf6fe06face0a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3578eb9-e0a1-4e59-be3c-822e55f2dd37/15223257405.pdf
    • https://uploads.strikinglycdn.com/files/a19903ab-c171-4781-8391-8954a56bc5d4/what_is_crp_in_blood_test_in_malayalam.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_off0000f1c5.bin
d6e1a8f815220a867643e87c4af0f7b74955dbd7a8db693535b1d5695a39b24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5508 bytes
font_01_sfnt_off0001048d.bin
eb307c61db2e98ed8e57725520a24fdc51e5149cdc81c756d823813b7470de20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10876 bytes
font_02_sfnt_off000129b7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 4324 bytes

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