Malicious PDF — malware analysis report

Static analysis result for SHA-256 88aaff2d18af3955…

MALICIOUS

PDF

93.5 KB Created: 2021-04-01 06:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b9249cef3926f8296c966b2498a826 SHA-1: 51431dbebe3123d8cc5c36e0adb68cdc1091c051 SHA-256: 88aaff2d18af3955018cdf9f9a9aa362c547b809807d43f0018d7fbefe1d4d09
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or SEO spam. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=abdomen+ultrasound+scan+report
    • http://madoxorijegobe.sportsontheweb.net/huckleberry_finn_life_on_the_river_quotes.pdf
    • https://volasetabis.weebly.com/uploads/1/3/4/8/134879514/nugewezuledewav.pdf
    • http://suwefazimim.medianewsonline.com/fevilixefazapup.pdf
    • https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/wufororal_jefav_podevebifopab_feximazekisor.pdf
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/199a062554e.pdf
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/ganavib.pdf
    • http://sadogiropi.mypressonline.com/moon_is_a_harsh_mistress_heinlein.pdf
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/vafewu.pdf
    • http://xisumagogali.getenjoyment.net/kagezativujutam.pdf
    • https://figovuliwa.weebly.com/uploads/1/3/4/4/134476313/7579895.pdf
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/fa18b8e2fb29.pdf
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/0e3841818.pdf
    • https://zufuzizulilok.weebly.com/uploads/1/3/4/7/134702460/3748365.pdf
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/7691255.pdf
    • http://patedeziw.mypressonline.com/v_guard_voltage_stabilizer_price_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_7cb703cc3ceb492b882837abe25db9d9.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_83f4b338168b4e58a65a9e25b952c433.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_92a229d03a2a4eb684817153eecda243.pdf?index=true
    • http://negumigimewote.onlinewebshop.net/52773698218.pdf
    • https://s3.amazonaws.com/wizakokowe/school_supplies_matching_worksheet.pdf
    • https://s3.amazonaws.com/bojafazes/61888804448.pdf
    • http://nabenejajoko.myartsonline.com/ejercicios_de_operaciones_combinadas_con_fracciones_2o_eso.pdf
    • http://kogotiru.myartsonline.com/66919767079.pdf
    • https://s3.amazonaws.com/satulibaren/17265240500.pdf
    • https://s3.amazonaws.com/wutogugej/wimajifotakaralu.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_off00013285.bin
1caef1ded988af4f96fe9fef222f3f26ad80a5e9c150b0e06e4d125f0941369e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 5348 bytes
font_01_sfnt_off00014492.bin
dd17e561e5b10079a23ff98938b6e65431d5a0e6e5d25ad177a313a28cdddb73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 10664 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.