Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0903c1cc9f65248…

MALICIOUS

PDF

127.5 KB Created: 2021-03-24 09:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d0cd65511a675f4601d190a5c5758fdc SHA-1: f957a2055e813da89bda00ae914c56c7903b0c48 SHA-256: f0903c1cc9f65248bca8286412c3f16e637332cb8151b9932fede29fccb543a7
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 point to other PDFs, suggesting a link farm designed to manipulate search engine results. The primary URL, https://maypoin.ru/wix?keyword=special+characters+allowed+lol, is likely a lure to a malicious site. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=special+characters+allowed+lol PDF link annotation
    • https://kadimonadi.weebly.com/uploads/1/3/4/4/134491006/2716617.pdfIn PDF document text
    • https://xupemapimosow.weebly.com/uploads/1/3/0/7/130776757/2261500.pdfIn PDF document text
    • http://thelait.pro/831502457375o9qx.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/129788577.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/nakutobup_mawukedez.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/64761007083.pdfIn PDF document text
    • http://mpvideo.org/woxufoxelefaxujusukua5hbq.pdfIn PDF document text
    • https://wijuzibodeba.weebly.com/uploads/1/3/0/7/130738798/5358213.pdfIn PDF document text
    • http://realwockyc.info/elements_of_programming_interviews_javal84vy.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/vasavovufajodut.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/how_to_make_a_study_guide_for_chemistry.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
    • http://fuguzametekobo.myartsonline.com/52152893147.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/lawalawaw.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_8195891d51d149828594eba67ec983f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/70777947633.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/send_email_with_attachment_in_php.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_71dd53874567444c8dfe8d7f3308284b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/cbdt_and_cbec_full_form.pdfIn PDF document text
    • https://6c4ab87d-8e52-4a97-8c5d-a16208ca9625.filesusr.com/ugd/0bcf16_bb2e8fdcd9db4f3c8c0f1bbd5f8c879e.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_8495215df4d74c328095f9464d4b3e93.pdf?index=trueIn PDF document text
    • http://bogalibamadom.myartsonline.com/sar_of_antimalarial_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/best_paid_android_apps_uk.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 7160 bytes
SHA-256: 5bf40c429e0ea0efa260bbd0225d8e56a3cf7dfd8df419b077b48519fca56604
font_01_sfnt_off00015532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15532 5040 bytes
SHA-256: 86dca71d379332d5b864f1f52f71a88423d5e3b630fde5c70d6fbecf338066f6
font_02_sfnt_off0001666b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666B 4384 bytes
SHA-256: a4b28dbf3326fe9029344ab9b9e9870a91a1fd9018a49aac81981da14ec3f6fa
font_03_sfnt_off000173ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AB 2204 bytes
SHA-256: 74eff8637941ddb80b94a20b302943a43d3fbbe6bc65ca10868c4a498b3e3f1a
font_04_sfnt_off00017d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D9A 28440 bytes
SHA-256: 94b4433e4133d62aacc59b1861e04031040dbf3e2a27803148056c3ded07b471
font_05_sfnt_off0001c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C57A 17844 bytes
SHA-256: 65ca83c5364ff0f39b20823a4a7864fc774b9e56d8c27d205843f9bea41df1bc
font_06_sfnt_off0001e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E137 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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