Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e5e7b7ceaa4cf5…

MALICIOUS

PDF

70.5 KB Created: 2021-06-01 18:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fbe2e841079c03d88caca3e5e50f94d SHA-1: db86eb9c272db5c43cdc6aaeecb4a8f5088e75e1 SHA-256: d5e5e7b7ceaa4cf5f46723ba620b1fad8a9eaac90115905bb33fbe37f6703df5
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to link farm-like domains (e.g., weebly.com). The heuristic PDF_SEO_LINK_FARM indicates a mass external link farm, suggesting a tactic to manipulate search engine rankings or redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML_NYX_PDF_MALICIOUS classification strongly suggest malicious intent, likely related to SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://drafthe.ru/pbw?utm_term=how+to+test+yourself+for+astigmatism
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/754910.pdf
    • https://xakezoram.weebly.com/uploads/1/3/4/4/134497816/bovutipero.pdf
    • https://cdn-cms.f-static.net/uploads/4377697/normal_602a29680a30f.pdf
    • https://mefivezetu.weebly.com/uploads/1/3/2/6/132681021/juveruwu-subekibofux-nedurumap-nekajuzerajijox.pdf
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/5196516.pdf
    • https://dirututusobed.weebly.com/uploads/1/3/5/3/135347210/5511487a.pdf
    • https://misodewegakev.weebly.com/uploads/1/3/4/7/134717908/1b9ab455.pdf
    • https://likivaduzizi.weebly.com/uploads/1/3/4/6/134699319/2c266048b81c010.pdf
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/gikijikon_vanokuzilakupo_lisikisisagiwib.pdf
    • https://cdn-cms.f-static.net/uploads/4387050/normal_602655c6b2a0e.pdf
    • https://cdn-cms.f-static.net/uploads/4448339/normal_601aebe2bef1d.pdf
    • https://kidepexabosu.weebly.com/uploads/1/3/4/2/134266059/pubogeravefebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7820ff29-7839-4031-9db8-7603bf057d4b/imperative_verbs_lesson_plan_year_1.pdf
    • https://uploads.strikinglycdn.com/files/caf3dec1-3952-4c2c-b264-5d0a7a2bdaaf/muxitezero.pdf
    • https://uploads.strikinglycdn.com/files/f1fcaf01-963d-4754-90c2-55906324681e/just_2_words_answers_level_218.pdf
    • https://uploads.strikinglycdn.com/files/31393fdc-d6fa-43ef-8b7d-b8270995f109/ripim.pdf
    • https://uploads.strikinglycdn.com/files/9ca2dd4c-b338-4f07-9506-c7888ac4eec6/the_alienist_release_date.pdf
    • https://uploads.strikinglycdn.com/files/2d604bea-f04c-409a-8645-3377ee767d20/23526829547.pdf
    • https://uploads.strikinglycdn.com/files/11a814ce-997e-46da-ab75-bfefffc5b084/rain_dial_plus_irritrol.pdf
    • https://uploads.strikinglycdn.com/files/a9efca6c-b185-43dd-bea5-c631e10759ed/20072457496.pdf
    • https://uploads.strikinglycdn.com/files/8ab5b100-f9e3-4b6f-b3dc-9b9e1f7d8a98/lg_g7_thinq_price_in_bangladesh_2021.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b2.bin
eb17904ed78f16bdee61e2bf0b99cc365f6158d1ebe60bee9c8388226a6f34e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 5240 bytes
font_01_sfnt_off0000e988.bin
debe0049b5f45dbbba983ff5c72bca30a194169bfa717b063ce4c6db7e1846c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 10272 bytes

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