Malicious PDF — malware analysis report

Static analysis result for SHA-256 158c0371a753cbd1…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 07:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6401f8d3816c46d28ef78f141d0b6f34 SHA-1: 91d5c935a985cb127e6e18ec4e5be0a4e2f925de SHA-256: 158c0371a753cbd1a8f68c63a6abe00340274cee1c29a8ed74674fbb380f89a0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or a distribution point for further malicious content. The document body text, though heavily obfuscated, indicates a lure related to rental agreements. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest potential for embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=addendum+to+rental+agreement+pdf
    • https://tijotado.weebly.com/uploads/1/3/1/3/131382447/paganolavorugexi.pdf
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/xigesibo_pevimon.pdf
    • http://gratoramaa.website/mapa_metro_sp_20203ivpp.pdf
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/bebupijuzuzawifoteni.pdf
    • https://zutepojajobemo.weebly.com/uploads/1/3/1/4/131454264/9c5ab9.pdf
    • http://letaraluzim.scienceontheweb.net/piduv.pdf
    • http://lexamopelezun.mywebcommunity.org/77742007449.pdf
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/85465edcf89c38.pdf
    • https://tolojosokuriw.weebly.com/uploads/1/3/5/3/135326177/bumuvilazuz_rigurovanu_nikidi.pdf
    • http://exampl1214.com/el_toro_ferdinando_cuentokaeuz.pdf
    • http://molotkov.site/bilal_powell_injury_reportuxshf.pdf
    • http://welitizenowem.mywebcommunity.org/21406722506.pdf
    • http://webmastervlad.ru/67160252541p31j3.pdf
    • http://medicinfo.online/xijufumenawixagaxodly6n6.pdf
    • http://erogancolumbia.site/milawujarevikulaipi09.pdf
    • https://vurigejowuzebad.weebly.com/uploads/1/3/3/9/133997249/febeg-matulupewiwa-mazogeza.pdf
    • https://walamemagiro.weebly.com/uploads/1/3/4/4/134441064/dufewavu-mibizutul-robokov.pdf
    • http://veloxezidirexob.iblogger.org/doxejavifikivogawako.pdf
    • http://sadogiropi.mypressonline.com/what_are_the_main_components_of_a_research_report.pdf
    • https://rekenapun.weebly.com/uploads/1/3/4/8/134851377/faveg-wikotofasekep-fotajo.pdf
    • http://zathkatow.xyz/jeberokapekoniwizaluzokoeibxu.pdf
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/14abb1b.pdf
    • http://lady-bug.club/palabras_simples_derivadas_compuestas_y_parasintticas2kbu7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ropigitapeda.rf.gd/the_new_farm_vegetarian_cookbook.pdf
    • http://livirava.atwebpages.com/50027987376.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_off0000ecf2.bin
bdc5547aaf802f96d275f9f79ffc6df2372de771799b950636cbdaf4bb7d7d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 5172 bytes
font_01_sfnt_off0000fe76.bin
52f8ebd6d746fbb34475c456767b3adfd9fe1929e20f3f0ebd0b753ad7a77378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10956 bytes

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