Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3759645f76f706c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 13:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315542b0f0c111c59a42e6e76fcffcee SHA-1: 584a20ba874937e8eb2c4e0c59cf0526263ad86d SHA-256: a3759645f76f706c9c94e1cb983c4b9e5ee5db5551b9e878e5fae609ee36a150
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The presence of external URIs and the ML classification strongly suggest this PDF is used as a lure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://jumiwimov.ru/wix?keyword=purple+color+prom+dress
    • http://mapomuwila.22web.org/zebewejetusidufigidozot.pdf
    • http://medazuxa.mywebcommunity.org/applied_psychology_in_human_resource_management_8th_edition.pdf
    • http://femuxeririta.mygamesonline.org/alif_tak_novel_download.pdf
    • http://vapabamulu.22web.org/lirigukorokewipa.pdf
    • http://govuled.mywebcommunity.org/modify_text_free_online.pdf
    • http://watodakazo.22web.org/84018558253.pdf
    • http://bokaxakoz.sportsontheweb.net/3726653930.pdf
    • https://cdn-cms.f-static.net/uploads/4369632/normal_603b3806b8735.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_60321e5fdba7b.pdf
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5ff8ca377f2a3.pdf
    • http://fesurowejo.mywebcommunity.org/omb_a-11_part_6_2019.pdf
    • http://bafiselavanebep.mywebcommunity.org/make_mead_like_a_viking_book.pdf
    • http://lazategomid.scienceontheweb.net/26695695720.pdf
    • https://static.s123-cdn-static.com/uploads/4418783/normal_5ff61d2dcc5bb.pdf
    • http://xepidenad.scienceontheweb.net/61402072340.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://magelul.epizy.com/lafudivofiberoki.pdf
    • http://doriponesarom.myartsonline.com/1868021268.pdf
    • http://garulolit.rf.gd/spanish_grammar_book.pdf
    • http://ximogubofew.epizy.com/94862113584.pdf
    • http://zivositad.rf.gd/ryobi_electric_chainsaw_chain_keeps_coming_off.pdf
    • http://lawewil.atwebpages.com/tecnologia_assistiva.pdf
    • http://judifexewarokam.epizy.com/ap_calculus_integral_practice_problems.pdf
    • http://kejufunekopal.epizy.com/chyawanprash_full_video_song.pdf
    • http://lekinip.epizy.com/affiliate_marketing_2020.pdf
    • http://wugerubuvugox.myartsonline.com/xunagejixinowesifaso.pdf
    • http://bagugexasorip.myartsonline.com/harry_potter_and_the_half-blood_prince_2009_trailer.pdf
    • http://ledaruwevegoxu.onlinewebshop.net/mitimeveguvevudivoka.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_off0000f4f2.bin
5f50c42de5d3ef4d6b9d6e64769d9885ffbb3a7e3d88580854b2ee59a418371a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 5008 bytes
font_01_sfnt_off000105e4.bin
969c1c287c82d482da6b2a40bd65dd7ab29a0234095134d364a9189f35734554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 10580 bytes

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