Malicious PDF — malware analysis report

Static analysis result for SHA-256 3763747e3051fbd7…

MALICIOUS

PDF

74.5 KB Created: 2021-04-07 21:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 01b25bc9d454aa8b071ae7bc4834293f SHA-1: 411675e50d331183fb96c961448cde91f396d080 SHA-256: 3763747e3051fbd73501be8da5b1a927e2badbd6814a867e99b36c5bc4ae062d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external links, including a suspicious URL pointing to 'mezovuduw.ru', suggesting it's used for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to psychology, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mezovuduw.ru/123?utm_term=autolesiones+psicologia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446374/normal_6014eff8efa14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_602044b7c5c57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_66b1e54e1aad46c6a21b57787d771125.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/febaa5c7-3fd1-4c6c-9f56-e4167608ea8a/los_juegos_del_hambre_2012_descargar.pdfIn PDF document text
    • http://vibejasejejake.epizy.com/beluzavisaxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db66ad1d-3f6e-441d-aff6-0c1657fc8ae7/71519298653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f849c5-360e-4656-98ff-4df9f019ef3d/4_digit_random_number_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c3ee77-7230-4f4f-96d8-90443032eba3/63316423329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2346f5-9ee3-4262-9189-e34d21aa1c38/54186087829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d34a8a-de83-41f1-b099-984f44b55738/attack_on_titan_season_3_part_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b01069-ba6d-4076-8b81-fcc3697324c6/is_maggianos_open_on_christmas_eve.pdfIn PDF document text
    • http://fudipakuvile.epizy.com/31685751842.pdfIn PDF document text
    • http://jonegukum.epizy.com/bikidujakasafewidav.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_9353db0f101b4e45bf7284752b3bd4c1.pdf?index=trueIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_c1ba3684f4b048a0b64f950b12e1f436.pdf?index=trueIn 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
    • https://medlineplus.gov/spanish/selfharm.htmlIn 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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5216 bytes
SHA-256: 0d27296cc40d10013a5886874bb343894ecac8fe4ec4aede363eedb5bafd2167
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 11708 bytes
SHA-256: 1577bd1f9c086f18cec2a921af65f3b83116fab7af24031fcf40718c47a7c701

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