Malicious PDF — malware analysis report

Static analysis result for SHA-256 0818dba7ef7f72ad…

MALICIOUS

PDF

75.9 KB Created: 2021-05-13 12:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81aec87150a53aa59f2375c9fde72bf5 SHA-1: a54dda2121d3e1e30e350ca352505d8982f09989 SHA-256: 0818dba7ef7f72ad49df1cf1ebcbc4023a683eedd0a0fe0fb69f0055c74fe083
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs, including one pointing to 'jottigo.ru', suggest a phishing or link-farming attack pattern. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings strongly indicate an attempt 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://jottigo.ru/strik?utm_term=graeber+debt+podcast PDF link annotation
    • http://ita-bio.space/harbor_breeze_merrimack_ii_52-in_matte_bronze_led_indoor_outdoor_ceiling_fan_with_light_kit_5-bladehs311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5fec1db36f036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_605e1334427ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_6030cc6ade620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_601b062109eca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fc9984120754.pdfIn PDF document text
    • http://wisecreditscore.info/how_to_draw_anime_female_body_posesd6yxa.pdfIn PDF document text
    • http://koolmaxt.online/40257188032xclyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ee8161-51c3-4f2c-9501-a31eeead836d/system_verilog_for_loop_variable.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_3799d46fb7af4562820541fe88717cca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad6b8df-e06b-4e09-9cf0-72df8a14c356/how_do_i_use_screen_mirroring_on_my_samsung_tv.pdfIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_3df508118f6348078be91b599ef347f0.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_7c4d982fb8154826a27d686c35ec4811.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_cf518647629349a5a51a9241b51219b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bd9135-0ad4-4d77-aa30-f99fdfd0ef4b/tenadirapulazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fad3c6-68c0-4527-a194-cd4219080e4d/37748716792.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_8e70559a9cd447d0be6223ca2ea006c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/023a8dd6-7f03-4634-adde-fd69edce280c/how_do_you_drink_crown_royal_black.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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 5204 bytes
SHA-256: df6bb69b8282a852b7f89bf4c0299d062769edfe37e0750f637b6a57727f48b6
font_01_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 10932 bytes
SHA-256: d123739b06aa468ffbef85f3feb65b2ff354c7c7ac6366b1aeab846aff0d02e4

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