Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6da70edc9b0b6b0…

MALICIOUS

PDF

91.1 KB Created: 2021-03-16 08:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5dce323f5377cb33465e613e9f0770ce SHA-1: 2eed4b610b887a7f2ca973fca62c3ac6330941c3 SHA-256: d6da70edc9b0b6b0fe4f9609541a69a08c5fe823c5418da2cfe24761087637b0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'applock for android apk free download' and a URL pointing to a link farm designed to redirect users to potentially unwanted software. The presence of numerous external URIs, many hosted on disposable domains, further supports the phishing and link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/wix?keyword=applock+for+android+apk+free+download PDF link annotation
    • http://storeyou.store/47966593391zlye2.pdfIn PDF document text
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/pupomekumur_sizodi_lekurenoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_6023fe3b2af57.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/1477596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_6010239f80ae8.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/is_there_a_way_to_turn_on_vizio_tv_without_remote.pdfIn PDF document text
    • http://stc-l.ru/archero_change_account_iosm0iu3.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/norexitivapa.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/88236743573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601ef39959bc9.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/how_often_does_a_2008_prius_need_an_oil_change.pdfIn PDF document text
    • http://help-verification.com/kavegerewilorutoletogelaj7xn63.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/5120367.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/texumilujinoxobijum.pdfIn PDF document text
    • http://lnstagramcentre.net/how_to_make_wolverine_claws_with_paperkwcx6.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://uploads.strikinglycdn.com/files/0bd6f997-8ca2-4a2f-9355-702f46c332f7/dark_psychology_101_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0112313d-28d2-42c1-9a56-76e3be474964/63356589170.pdfIn PDF document text
    • http://solezod.myartsonline.com/nogipumikezuwedamase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20362ac1-3adc-40dc-9a1e-75840a8152e2/blender_2.8_modeling_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/awards_for_all_form.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/56502081373.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/xoregiwolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a6fbb0-6c70-4e1a-8f9c-979ab23b617b/how_to_setup_hp_officejet_pro_8600_plus_wireless.pdfIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 2900 bytes
SHA-256: af1faac4edf213704ac67f95ae914594ebf3f706b38aef9b4bed1d7a70441c81
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 4824 bytes
SHA-256: 56aff1734e0d68a36200c5f7729d31b70e384b20c0e22c5111fe9a786cf1e7de
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 11452 bytes
SHA-256: ebf145be8a7eed98b8a16e9cb781da37ac9d41668c47b5919bae8a036c647397
font_03_sfnt_off00013376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13376 17616 bytes
SHA-256: f37f95d8a04e6926d0d0b00effc534a6d480075a5157b39453a5ae062c4a6109
font_04_sfnt_off00014d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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