Malicious PDF — malware analysis report

Static analysis result for SHA-256 5131f7a6f2ca2f86…

MALICIOUS

PDF

76.0 KB Created: 2021-03-23 12:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d80e54992220300e53b6a83fba1d04e5 SHA-1: 29875297aa94bdc4c9b15b9fb664fcba4abe2804 SHA-256: 5131f7a6f2ca2f860fab7e2d477f87199ba3c82242212a7f7eac41a808a13fc6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a phishing or SEO spam campaign, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://dugedepap.ru/strik?utm_term=rinnai+rl94ip+vent+kit
    • https://lujiwosibe.weebly.com/uploads/1/3/4/0/134040634/c917dd7543ce.pdf
    • http://nawumamarupojo.22web.org/icassp_2019_latex_template.pdf
    • http://maxoranano.sportsontheweb.net/vumifidobotalanimebodewi.pdf
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/fiwozusexalodo.pdf
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/366507.pdf
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/zozipef.pdf
    • http://bunedose.22web.org/aseprite_compiled_sources.pdf
    • http://kmikaerfs.ru/37516282610p6cwp.pdf
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/738a163.pdf
    • http://emirofficialzm.com/tumadanunb6jxn.pdf
    • http://supariwepexafat.mywebcommunity.org/gopapewopabofudefamiser.pdf
    • https://nodeseverew.weebly.com/uploads/1/3/5/3/135323512/sedazav.pdf
    • http://0fruits.space/xederagumuriqkeds.pdf
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/lopupizifuso.pdf
    • https://lafitezin.weebly.com/uploads/1/3/5/3/135323108/dagat.pdf
    • http://kmikaerfs.ru/how_to_make_hard_boiled_eggs_in_a_power_cooker_plus11cbd.pdf
    • https://mogifunowev.weebly.com/uploads/1/3/0/7/130739313/lodijazokupenezemulu.pdf
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/f0144d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_8856e8f2f2224dc7acd3729235ce7fa0.pdf?index=true
    • http://rodujuvutadaxam.epizy.com/indeed_app_for_pc.pdf
    • http://natexaz.rf.gd/84149100547.pdf
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_a5f150f11e54487f8dbac11841b147a1.pdf?index=true
    • 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_off0000edb7.bin
dde7aee69abf501bc138266b7716fc17e76f7011e1d07da872992e5b72de6b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5012 bytes
font_01_sfnt_off0000fee7.bin
6fc9ccc04ce74d3af3f3013be5afe1b7a918c3026e60f04df82a25300d48dcde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 10584 bytes

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