Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0ba61f00326e84…

MALICIOUS

PDF

71.8 KB Created: 2021-02-22 02:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 65c735cf5bf9907cdd912a842ab408f2 SHA-1: 9a22ab05ee7c3c9b8379699383d6919829e15780 SHA-256: ce0ba61f00326e849518ea70a9892420e009eb364c925d590f2033a66355bd84
224 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document also employs a lure for password-protected archives, suggesting a multi-stage attack where the user is prompted to decrypt a payload. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://yafferge.ru/123?utm_term=diablo+2+lord+of+destruction+hero+editor+1.07 In PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/cbb1f.pdfIn PDF document text
    • http://dkblogin-de.com/bootstrap_3_file_upload_formd9yi2.pdfIn PDF document text
    • http://iwhite.space/online_android_virus_scan10jmc.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/ijchbjj/learn_dev_c_programming.pdfIn PDF document text
    • http://ultra0.space/97259828378il4tc.pdfIn PDF document text
    • https://rajikaluniker.weebly.com/uploads/1/3/1/3/131383998/1372380.pdfIn PDF document text
    • http://uscreditmonitoring.info/36790344674zc47r.pdfIn PDF document text
    • http://safetymirrors.xyz/64487302848gvhnb.pdfIn PDF document text
    • http://iclod.tech/guxadogipomosoz4sfk.pdfIn PDF document text
    • http://mysteps.online/how_to_play_dice_pirates_of_the_caribbeanqti8q.pdfIn PDF document text
    • http://weareanonymous.org/gasefox8dc5n.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/jutenojamega/harvest_moon_light_of_hope_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/ullathai_allitha_movie_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/41719913128.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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 5688 bytes
SHA-256: 3a181d3b3eb105921c27414a4a35bf401a297c7f237c29eba44a62ea447504ac
font_01_sfnt_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 12756 bytes
SHA-256: ce358418474f124230d8059e375723cad8d7e5c1b2927b2b45d8b3b7760a0a24

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