Malicious PDF — malware analysis report

Static analysis result for SHA-256 355f15f44073a3d5…

MALICIOUS

PDF

74.1 KB Created: 2021-02-16 20:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 79270941d509bcdd65dccb0de6fc21be SHA-1: 88a0bf2801bb04ae0f4847dd59b0eb2ee18600b9 SHA-256: 355f15f44073a3d56de8cb7f2e1a1f29b745e4e85dfa94c1581fd4488d1531d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/123?utm_term=robin+hood+disney+songs+phony+king+of+england PDF link annotation
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/3599425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446289/normal_60014231b7ff9.pdfIn PDF document text
    • https://cdn.sqhk.co/zepaginu/hjacgfL/11575923506.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/1hfthdF/piano_despacito_best_tiles_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500665/normal_5ffc6a90133c5.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/b8e5ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_601e805b59ad4.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/jafupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422884/normal_60030ced8a27e.pdfIn PDF document text
    • https://gejixivipoza.weebly.com/uploads/1/3/0/9/130969358/ad14f9029eb5e.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/linopomuke.pdfIn PDF document text
    • https://gubulugovidenu.weebly.com/uploads/1/3/1/4/131406252/gabuviwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_6005af8511344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_5fe65160eb585.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/sebunuzu/sonijevarinizajar.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/registration_form_using_ajax_php_mysql.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/birthday_calendars_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/gupubizewijivege.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 5520 bytes
SHA-256: 3cc7d5fa680e2bad8ddb815268a8106d5479b8701fb6b6ee0b4d52dcba94e98e
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 10304 bytes
SHA-256: cb0f8ee29ff8a1edd7649f4e535b3e3a127005c2182f6d8aa23c8ec8971dbc35

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