Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d7010fd7386c34…

MALICIOUS

PDF

88.4 KB Created: 2021-01-21 03:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a078b63ebfef37541a37bf5b4ef76265 SHA-1: e9ab63bfc5d70ee4123efdf604b1d38084d669cb SHA-256: d3d7010fd7386c34297a163fc6c9c139831579ff17ee7d60cd9a58498e1cbe9a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various websites, suggesting an attempt to redirect users for phishing or SEO spam purposes. The document body is heavily obfuscated and unreadable, but the presence of external links and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=voleibol+reglas+fundamentales PDF link annotation
    • https://terodovob.weebly.com/uploads/1/3/0/7/130776228/6917201.pdfIn PDF document text
    • https://zirowebepalijiw.weebly.com/uploads/1/3/3/9/133986526/rixawugerata.pdfIn PDF document text
    • https://site-1172317.mozfiles.com/files/1172317/scalability_testing_in_performance_testing.pdfIn PDF document text
    • https://site-1175279.mozfiles.com/files/1175279/labrador_dog_hd_images_free_download.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/wuzokasaj.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/d48bb1496b4.pdfIn PDF document text
    • https://site-1176519.mozfiles.com/files/1176519/feedback_loops_glucose_and_glucagon_answer_key.pdfIn PDF document text
    • https://site-1175041.mozfiles.com/files/1175041/mulegizevavurev.pdfIn PDF document text
    • https://site-1173572.mozfiles.com/files/1173572/sputnik_1957_cold_war.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/a99599bd3d.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/serefanezebanumoj.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/675f7be3.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/938122.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/pemuwonup-ziwifazaneme-sikeda.pdfIn PDF document text
    • https://nekewagan.weebly.com/uploads/1/3/4/8/134881830/2744833.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zikeko/igi_1_direct_for_android_apk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 5332 bytes
SHA-256: d7e33b2f7a686104f40915e2f88d9caa6ba769cf7a207c196b964c4327dd75f6
font_01_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 11432 bytes
SHA-256: 7c3c65285c0f74582685f87371a36f200bbfac90da201c252728f239d6bf3cc9
font_03_sfnt_off00013df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1