Malicious PDF — malware analysis report

Static analysis result for SHA-256 48871701bb1c358a…

MALICIOUS

PDF

96.3 KB Created: 2021-03-10 00:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 71706e1f5abc3688fae5d7cc7802c023 SHA-1: e9c25007023b500377c0ed5dbbe854a986d93e62 SHA-256: 48871701bb1c358a4d67b4da602e5cfa4e655f73ab5916a18a04cb8a18a14e57
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 to benign-looking documents, but one critical heuristic identified this as a link farm. The primary malicious URL, https://nipisod.ru/123?utm_term=e+commerce+industry+reports, is likely used to host a phishing page or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF structure suggests it's designed to appear as an industry report to trick users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=e+commerce+industry+reports PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5ff67c565b988.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/fukinizi-setilirizefemiv-moxet-gezikavabewogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_60170642d1bc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5fc92d4a21d98.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/1397484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nuxomigo/jio_phone_voice_recorder_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf2f232-a2bc-4ef4-8ebe-50f5e5fab908/88672208389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6289ae-bc5d-4c61-9a6b-e63f04a3e41e/yesterday_tractor_hauling.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/fifty_shades_of_grey_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b1982b-d58a-49cb-a96d-c61f331f3283/vokusutogititu.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/creative_sound_blaster_x-fi_surround_5.1_pro_usb_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/wrong_turn_5_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/ameritron_al-80b_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31b741e-5c2b-4a51-a622-6ed3021d8573/five_nights_at_freddys_the_silver_eyes_free_download.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_5978681b9fbe4d63a91fc821643c6d58.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_4946c6ed2f1c4c959da7412073edc5bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8d4955-e247-4828-9242-40cdb08b8a84/traxxas_stampede_2wd_grave_digger_body.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_e68a505170534d9caf651af0c2391f2c.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_84f3510db2184c92895467aaf49293fe.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014d0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14D0D 17092 bytes
SHA-256: 2dfecc49581fccff15a9c372e12661329abb28d8c200f33006bab6922319a52f
font_00_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 4920 bytes
SHA-256: ba10dd44483f114c50480e8a69d1e9001caf22ac1df2f384decd1048646b0970
font_01_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 11272 bytes
SHA-256: 76e7e010b79819c4c0144a796756c14cbb1221d49eae96b28042a964daf4425d
font_03_sfnt_off0001657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333