Malicious PDF — malware analysis report

Static analysis result for SHA-256 91320d7d11d8569c…

MALICIOUS

PDF

66.1 KB Created: 2021-02-24 10:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 643a0b263d3a2812280543d246d212a3 SHA-1: 543647cefdd2706c3165bbe4eba2e1aa652f6fa6 SHA-256: 91320d7d11d8569c86790fafae0bbcad9999d5ab1b6f02b6c874996364ade35a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or facilitate further compromise.

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://seumenha.ru/123?utm_term=bsa-optics+red+dot+rd30 PDF link annotation
    • https://cdn.sqhk.co/reriwoduriju/gKheJFR/jupefadamibekuxosemelitek.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/9222886.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/AjhhhfF/ww2_anti_aircraft_gun_range.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/kunejiwupigemo_zosete_wulejijujiri_dudenon.pdfIn PDF document text
    • https://sirutobij.weebly.com/uploads/1/3/0/7/130776617/41af93.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/8pjdUaq/drag_bike_racers_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/cXw1cV0/fadolavakuguxapelisozi.pdfIn PDF document text
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/zejewaretuj-biletedu-bubevalemexus.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ib4VSgj/virus_news_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/jjhgi9M/vademon.pdfIn PDF document text
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/migivamolizaremeraru.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderimi/bjcIhcz/36038687450.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/zotenus.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/fekazudabo/62199238341.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/picsart_mod_apk_latest_version.pdfIn PDF document text
    • http://xofududegotu.epizy.com/58192633492.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/what_is_the_best_gps_golf_watch.pdfIn PDF document text
    • http://niruduzef.epizy.com/soxixawitinotovowo.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/bumekelamonafen.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/bumblebee_transformer_movie_review.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_off0000c33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33A 5420 bytes
SHA-256: 1494f0944f8fd66ee7bf1a06f7b96d329ae8f48196aa244ebe92059acb2aef9c
font_01_sfnt_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 11388 bytes
SHA-256: d014763c518c7952dac04fcc63b883da1e0009d928c5ae8cb4134873ca527702

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