Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4a77784d1942df…

MALICIOUS

PDF

84.9 KB Created: 2021-02-28 02:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0c688eb44ee8a0c77f5546b2b4a94d3 SHA-1: 28459b90363fdbb6e95ebd2d5d18ac8bf24a3ca5 SHA-256: 4d4a77784d1942df8fdbf3ccf581947e1175d7bb62e3e14740ddf66cd8b28ae2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The document body, though heavily obfuscated, appears to be a lure related to land measurements, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=cuanto+mide+un+terreno+de+300+metros+cuadrados PDF link annotation
    • http://sevelorovuwo.66ghz.com/44881581101.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/misajexumipo.pdfIn PDF document text
    • http://fifamarketbot.com/dd_3.5_prestige_classes_tier_list79rgb.pdfIn PDF document text
    • http://doordash.link/252922309380724c.pdfIn PDF document text
    • http://hugertely.xyz/gaduvideramofogoq75k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_600f64ec9d95b.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/java_swing_button_color.pdfIn PDF document text
    • http://rkconstructionsucks.com/jet_li_filmleriprvms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_6021aeb856efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_602835f2dd744.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/homo_deus_a_brief_history_of_tomorrow_summary.pdfIn PDF document text
    • http://callup.today/whats_the_difference_between_hopper_2_and_hopper_3a85in.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/quickest_way_to_get_rid_of_poison_ivy_rash.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxutakizet.epizy.com/apple_itunes_free_in_english.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/10504668308.pdfIn PDF document text
    • http://giwuvupajot.epizy.com/how_to_loosen_tight_elastic.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_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 5264 bytes
SHA-256: 6e4cf12c410f5effa167302234b74955d9a69b2a637cc99a6690698ba81879f0
font_01_sfnt_off00011a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 13420 bytes
SHA-256: a2b0d12af8f27c97ecd3f92ad09d89a3eb29e1679b6498a62e02031cc239667c

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