Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9121256168f34b…

MALICIOUS

PDF

77.1 KB Created: 2021-01-21 11:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cf77795024c4e459fe507f9063c58247 SHA-1: 7ad44e255da9d4258b92c6d5cb1e3d8c2c939003 SHA-256: ec9121256168f34bab967c2d40c2c230c9c6fcc4f0699ae0dd934d5ccdf8be39
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or unknown reputation sites, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious content.

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 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://druttle.ru/123?utm_term=queen+anne+cherries+trees PDF link annotation
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/1356737.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/iOgfhen/8947244857.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/SQP8gMs/the_polytechnic_university_of_hong_kong_address.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/gkTmIii/56716172086.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/hgNggid/nano_golf_hole_in_one_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/ibsic6z/mipopituvov.pdfIn PDF document text
    • https://cdn.sqhk.co/xetosusaxi/96ibWid/90_s_hit_songs_list_in_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://keputeka.epizy.com/39485824520.pdfIn PDF document text
    • http://jigiwema.epizy.com/nibikugazafegiwininuxudab.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/kannada_film_song_new.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/solar_system_planets_information.pdfIn PDF document text
    • http://kulitetokap.epizy.com/color_code_in_android_studio.pdfIn PDF document text
    • http://sezigan.epizy.com/52798833971.pdfIn PDF document text
    • http://betiger.epizy.com/bekaboo_full_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/formation_biodynamie_obernai.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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 4688 bytes
SHA-256: 34020c989200592423d642bd01fa0a6293bc3ef16011dc901a5c3b4f41e9f05b
font_01_sfnt_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 11684 bytes
SHA-256: 154b45a0c501c87e29c90ce62886968e37f830409b580505afec61583b31dc32
font_02_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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