Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d35843445052d88…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 00:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: eb411ffd3840b25e4d1d7edd5fb2e5b5 SHA-1: 82411cb7548a9aff05f14fa69648a8a3bbabb853 SHA-256: 6d35843445052d881419e1dc37fca142fa9f59f6ae68357e5086b41d523a7fb6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to an 'Iphone 11 user guide'. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself likely facilitates the redirection 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://mezovuduw.ru/123?utm_term=iphone+11+user+guide+for+dummies PDF link annotation
    • http://fafesixokegigi.getenjoyment.net/physical_education_learning_packets_14_weightlifting_answers.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/vafimexedig.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/durga_suktam_meaning_in_telugu.pdfIn PDF document text
    • http://lifeshop.pro/68232820922890hn.pdfIn PDF document text
    • http://felejus.iblogger.org/75009619252.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/9339388.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/levojisotuzame-zurab-babilu-defawoso.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/1043751.pdfIn PDF document text
    • http://rokonagusedat.22web.org/harry_potter_book_5.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/sejulotik_zewedele_nesazaki.pdfIn PDF document text
    • http://the-glow.ru/girabigoratebifapu31o4l.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/rca_galileo_pro_11.5_32gb_2-in-1_tablet_with_keyboard_case_android_os_blue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexufigifex.epizy.com/yamaha_powerstroke_3100_psi_pressure_washer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/sharepoint_tutorial.pdfIn PDF document text
    • http://vuxifonodine.epizy.com/5441553339.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/pillars_of_eternity_2_inquisitor_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/biman_bangladesh_airlines_application_form.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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 5200 bytes
SHA-256: 2ce8a5f9073e3f1301c91bc1c8764fed996e27a597219fa804a14c76c01f0203
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10692 bytes
SHA-256: babc9d52032b50ba1e78c2fea2cbc5d4f6448f5765dca34828945e5ba1b393dd

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