Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb0ab4b00a9230c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 18:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c607ee57850785fe4ec40a5356c95e2 SHA-1: 7806455ac2e5113b01c5c22cbf3fdf60f6ea5a24 SHA-256: 7eb0ab4b00a9230cee62e0c18c0452e833cc8c74ff76fa48afedaf0c27de11b2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a likely SEO manipulation or content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded URLs serving as the primary attack vector. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=physics+temperature+conversion+worksheet
    • https://koxabiniz.weebly.com/uploads/1/3/5/9/135994092/xomoxu-pevimiwovopogo-nipuwexaba-pujebovofepu.pdf
    • https://cdn-cms.f-static.net/uploads/4416144/normal_603d1b3700cec.pdf
    • http://visezuxopusifik.iblogger.org/membrane_function_pogil_answers.pdf
    • https://birulivalofa.weebly.com/uploads/1/3/4/0/134013213/a7d9f.pdf
    • https://cdn.sqhk.co/girolivudafo/uGBjfhd/5718255363.pdf
    • https://deluneruniji.weebly.com/uploads/1/3/4/0/134012649/wavoluwirotin.pdf
    • https://cdn.sqhk.co/mofijovelu/tibIMjh/change_your_mindset_audiobook.pdf
    • https://cdn-cms.f-static.net/uploads/4368991/normal_600a5a7a2a788.pdf
    • https://cdn-cms.f-static.net/uploads/4462775/normal_602940972a1a3.pdf
    • https://lipojiwogim.weebly.com/uploads/1/3/0/7/130776075/5500754.pdf
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fd67c2d10eb7.pdf
    • https://cdn.sqhk.co/woluzadeviv/sSiijE5/27636970797.pdf
    • https://cdn.sqhk.co/lididiregi/lhHieqi/92268648599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rujemivegelap.epizy.com/29710095446.pdf
    • https://s3.amazonaws.com/gezetega/62046858009.pdf
    • https://uploads.strikinglycdn.com/files/6c660c94-9828-4c0d-a447-0389263e48a1/how_much_did_michael_burry_make_in_the_big_short.pdf
    • https://s3.amazonaws.com/rurosaveruk/rufus_bootable_usb_windows_xp.pdf
    • https://s3.amazonaws.com/jefobexapulow/mission_mangal_movie_pagalmovies_hd.pdf
    • https://s3.amazonaws.com/wazotojemov/sitozudeno.pdf
    • https://uploads.strikinglycdn.com/files/d76a453c-a9e4-46de-8c2c-a2065265d6d7/algebra_1_eoc_practice_test_online.pdf
    • https://uploads.strikinglycdn.com/files/e133bc48-060b-43e4-b8ab-92888737b3b9/nekupexafove.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd4.bin
a2a3741dc5613aa2026d56c42c343052042cd8f6844c0466d1bed2a1b0fc8be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5344 bytes
font_01_sfnt_off0000f1e2.bin
d168fcbb316fccfb5104cb9a530df9f8c5e8c637ab56e0a423780212aa2bc421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 10464 bytes
font_02_sfnt_off000115b9.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 4324 bytes

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