Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a05deb7840e345…

MALICIOUS

PDF

80.3 KB Created: 2021-02-18 17:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 41d1fa889e83d612a56e2b5723e976ae SHA-1: 5351877d9e38168eb3312dac174a3fa3dff5b4b6 SHA-256: 26a05deb7840e345c7410749ad6b64902287333b8ddcdae39a8d20d8b7bcd6e9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to SEO-optimized PDF files hosted on various domains, many of which appear to be disposable. This behavior is characteristic of link farms used to distribute malicious content or conduct phishing campaigns. ClamAV and ML classifiers also flagged this file as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=finding+zeros+of+polynomials+worksheet+algebra+1 PDF link annotation
    • http://repair-monokoles.ru/how_to_learn_english_classes_near_mee36ct.pdfIn PDF document text
    • http://epipog.com/advance_auto_parts_san_antonio_jobs8do16.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/hgACgfO/jabakujitinezul.pdfIn PDF document text
    • http://trelon.fun/rawevivzy1ca.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/letupupaludakarerecr8k.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/gfgj4jb/granny_s_house_online_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/eHgcIWx/9467830589.pdfIn PDF document text
    • http://mebel-albero.ru/jamey_aebersold_christmas1zt4j.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/LgcghYQ/58282564345.pdfIn PDF document text
    • http://dresdenpharma.ru/bididexezilaxowesap1705r.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/2354959.pdfIn PDF document text
    • http://yblda.fun/apostila_de_discipulado_para_novos_convertidosgxhom.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/xotezopikijo.pdfIn PDF document text
    • https://labufixurugon.weebly.com/uploads/1/3/4/8/134873424/serijadugodumukiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatufagenis.rf.gd/72566998466.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 5912 bytes
SHA-256: 233f1a0aef9b94990f5636162e9e939e120fd6d01ca8f527bd8f44177445c356
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10700 bytes
SHA-256: 6b0a96bbfa99f5d571b3c08eebf957e37be5a4ecc41fedd4fdf5d9d237bb7bc0
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16144 bytes
SHA-256: a0532d1212509dae036733b1fb6f303b0d7fd7a209d3928fdad713008da19d30

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