Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7883542ee1c3d4f…

MALICIOUS

PDF

77.7 KB Created: 2021-04-18 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 66ed2e1bc4e3cfe5d7f34c777a689e64 SHA-1: b1d99ee3ec8c33628769a55521d501f1c0b3f01d SHA-256: d7883542ee1c3d4f35557e0d607f4ab1adf50df48e14400e6ba3b60403b360fb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=char-broil+patio+bistro+infrared+electric+grill+parts PDF link annotation
    • https://solugelefeko.weebly.com/uploads/1/3/0/7/130740562/2240956.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/tjehicY/xevoxamixixemamim.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • http://odemebayisitrafik.com/akshara_birthday_song3p1j9.pdfIn PDF document text
    • http://idealicaitaly.site/521031459801hysw.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/geruraboxevolawur.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/LgggdNY/octopus_garden_beatles_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/XuhaggW/20135904591.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/iiEWgbb/beli_diamond_ff_pakai_pulsa_telkomsel_murah.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/hxrhemN/sozozev.pdfIn PDF document text
    • http://pollsexpert.com/yale_brown_obsessive_compulsive_scale_ii3fqqn.pdfIn PDF document text
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/1162990.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/84219.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/sadotasiwasesikuki.pdfIn PDF document text
    • http://afracheat8.xyz/liwubepuzesetirirojqwrex.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jcFggia/global_warming_definition_oxford_dictionary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_aaeb060edf5a4443975e8e1b3341d2d9.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_34d11f905ba8402686f34abbe6dae6e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/82974465994.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/arabic_phrases_with_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/14132855899.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/cloverdale_sda_church_directory.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/tai_cctalk_android.pdfIn 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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 5492 bytes
SHA-256: d560114e2a6a7fdd3411b1393b69178fdb42faacad6eac96b2ecac2520b1cabc
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11064 bytes
SHA-256: 48739157039ff45912009394defdfac3b0891cca90871f96313d706127e85513

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