Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecea6852c786cc65…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 19:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243e2d1e30c19eb12cb30924e4642652 SHA-1: 2429a4748f0d97fabe9e7259aa08b99f0de3ef9b SHA-256: ecea6852c786cc65ef602079cef079008d0399325c50a66b7bc41aaecf81ecaa
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/123?utm_term=infrastructure+as+code+morris+pdf
    • https://cdn-cms.f-static.net/uploads/4499972/normal_600b5bb68f396.pdf
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/guwudiru.pdf
    • https://cdn-cms.f-static.net/uploads/4414487/normal_6021282f109fe.pdf
    • http://kifopelidito.mypressonline.com/romberg_test.pdf
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/nimizobeto.pdf
    • https://ponorevex.weebly.com/uploads/1/3/1/3/131398269/xokejegiborel_tugetusolunin.pdf
    • http://mmmuuuue.space/how_to_rebuild_a_12.5_briggs_and_stratton_engine54es1.pdf
    • http://immortal-sho.club/48506752730amyra.pdf
    • http://ritual-venki.online/10920451710yhncq.pdf
    • https://cdn-cms.f-static.net/uploads/4470028/normal_6048a4d116370.pdf
    • http://nanolenka.xyz/jathagam_biodata_format_in_tamil34acs.pdf
    • https://static.s123-cdn-static.com/uploads/4472479/normal_5ff158ddc7fec.pdf
    • https://cdn-cms.f-static.net/uploads/4383475/normal_6013772f322d0.pdf
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/bubemopa_verixotuxexix.pdf
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6009f6882c45e.pdf
    • http://gefosezidubajoz.scienceontheweb.net/numafaweleputulog.pdf
    • http://vomimaforotagi.mywebcommunity.org/pollo_loco_nutrition_keto_taco.pdf
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5fdd8d0657aa0.pdf
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/xobagukoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vawunelevuwatex.epizy.com/apologizing_email_format.pdf
    • http://zepuwiz.atwebpages.com/41654024700.pdf
    • http://bedevekozazabe.rf.gd/telefono_es_aguda_llana_o_esdrujula.pdf
    • http://zimopup.myartsonline.com/dijukumij.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_off0000efd2.bin
1718dda8312e5eddda7908740f3577edc31a1b848f63982b52d40bbba28cbaea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 5208 bytes
font_01_sfnt_off00010170.bin
f5b20fad1a698e0dbf6ffc537a54f3adf4696449348bcd14df39bd654f01537a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 11736 bytes

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