Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79078238d1538b1…

MALICIOUS

PDF

80.8 KB Created: 2021-03-17 13:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0a23f82da8c42bcf1cbbc5235f62e214 SHA-1: 453357fdae0ae8c51099618ad594e8506685875a SHA-256: a79078238d1538b128c0f082b44e82cece688912cef84a2b8074402229d9d28c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm with numerous external URLs, many pointing to disposable hosting, designed to obscure the ultimate download destination. The document body, though heavily obfuscated, suggests a lure related to cracked software, specifically 'Coreldraw x8 portable full crack'. No scripts were extracted, but the presence of a link farm and the phishing/malware detection strongly indicate an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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.
  • 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://resalured.ru/123?utm_term=coreldraw+x8+portable+full+crack PDF link annotation
    • http://prizinsta.site/mofejonuzowefusefuwm7vbi.pdfIn PDF document text
    • http://superheatbelt.xyz/mechanical_properties_of_materialsvkp5h.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/xagaliwade.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/fb5ef53294f.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/FjcXicg/xekemepipoferopetek.pdfIn PDF document text
    • http://naturebiolog.space/11650610542bw9f5.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/HpBig7f/kakakejinomujozotupusi.pdfIn PDF document text
    • http://cosmicgig.com/agama_jainisme7vm6y.pdfIn PDF document text
    • http://wow50.pro/mechanics_of_materials_8th_edition_solutions_gere7d9xo.pdfIn PDF document text
    • http://premial.su/how_to_pair_logitech_k800y0awi.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/p4ieQO9/media_player_android_tv.pdfIn PDF document text
    • http://namelesssouth.xyz/compressor_isentropic_efficiency_equationq6fw8.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/5467630.pdfIn PDF document text
    • http://copyrightprivacy.site/xunakowukavezfq7dr.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/nilafed_tasidadewe.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/Ajcmija/fandango_amc_24_hamilton_nj.pdfIn PDF document text
    • http://baltika-trans.ru/45849514603boric.pdfIn PDF document text
    • http://cocobuka3.xyz/dune_book_20206evtt.pdfIn PDF document text
    • https://toxodomof.weebly.com/uploads/1/3/1/3/131384531/bagoge.pdfIn PDF document text
    • http://mixit.info/pavonusi8sy5r.pdfIn PDF document text
    • http://setofexperience.site/amsco_apush_2018_short_answer_keygcasv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_6303c8ecb8674e48b05a88daff49356b.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_3983b443558a4213aaa0508ea5d912f7.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_5317e83d8ba44c74b67bb52bdbb3749e.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_6cf7e12bf39a43619e1d4413869c68ca.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_b32ed738435a40dc9f4158788751f3e9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 5432 bytes
SHA-256: 34ecad55f866ccc62b6387f7cec3f52974c765222533ec2507b44115adc956f3
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 20872 bytes
SHA-256: 5730912ab3a8781a66929a8b71e1bc6bca887061ac7cda64892a6bccca5b992c

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