Malicious PDF — malware analysis report

Static analysis result for SHA-256 394105b4cdc13763…

MALICIOUS

PDF

73.4 KB Created: 2021-02-17 06:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: efc51dd083eb30c1fe06435b38eb4034 SHA-1: 9a9c8d4b64abfb1786a7007fce635d6269633f94 SHA-256: 394105b4cdc13763fc1e0ca31e99478271e8ec52693d0a006f2d772d9e190af0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains a large number of external links, including one pointing to a URL that appears to be part of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=a+lesson+before+dying+audiobook+chapter+2 PDF link annotation
    • https://cdn.sqhk.co/lafuwexale/iihagfY/funny_pics_of_dogs_and_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/iiKC7Nm/vilapaxamirejukerupunapu.pdfIn PDF document text
    • https://pupinalakarer.weebly.com/uploads/1/3/4/2/134234580/2969017.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/dafunutux-kabixorigu-jivapud-jalejisinajo.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/fhbhbjb/houseparty_app_login.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/4a496077.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/anjguic/photo_transfer_app_from_iphone_to_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/hhLihjd/gugitifowuminijumuz.pdfIn PDF document text
    • https://jexewibovagajuk.weebly.com/uploads/1/3/4/4/134485971/1769521.pdfIn PDF document text
    • https://cdn.sqhk.co/xogeloke/ha5kGhb/miraculous_russian.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_6023bb111c5d6.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/muvemasoxaji/speak_up_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/26264101175.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/1540599974.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/69397505492.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/garugulamipejapagowodat.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 5844 bytes
SHA-256: 6fc827b4f0006885b426eecba99599dbb55d218502e71121089e4e4b84f00b96
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 12232 bytes
SHA-256: 889b7c8fcf41273885b77e050c5f5f40e2738d518e4c598db6356b0ad7ee1644

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