Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bdbc81c486ca88…

MALICIOUS

PDF

80.5 KB Created: 2021-05-21 01:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 679b9c948c4d3da8d12e7cbf1c362698 SHA-1: 73785bc8ddd2851557e4753bd2dd2f59cd49bed9 SHA-256: a2bdbc81c486ca88b8f7b90d29a3316ecf2ceb4741fb9634757efc126938ce31
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://golowaki.ru/strik?utm_term=who+am+i+as+a+woman+of+god PDF link annotation
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/zexalamabinejaxaj.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/sovogejajununijigev.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/7ba2b4666b7.pdfIn PDF document text
    • https://bameveba.weebly.com/uploads/1/3/4/1/134108569/451845.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/3955022.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/dajewug_zanoxerilifofi_femaj.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/mezobixef_miwasudikume.pdfIn PDF document text
    • https://favasonod.weebly.com/uploads/1/3/2/7/132740296/rebefoja.pdfIn PDF document text
    • https://mawepalutolura.weebly.com/uploads/1/3/4/0/134040672/74e8bab7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/basalt_magmas_form_what_type_of_volcano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7321d512-9025-44a7-b4c4-0a21a058ebe7/limites_con_funciones_trigonometricas_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e32f92a-8574-4c85-9878-a61a2c0f954e/2007_jeep_grand_cherokee_srt8_led_headlights.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/lagu_ajari_aku_cara_mencintaimu.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/crispr_guide_design_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f301e5f8-e773-48da-ae98-a86b223b4a77/fomupiviges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75180de-3d7b-4093-889a-1247a82ef33a/what_are_the_five_principles_of_cultural_competence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846fc3a1-68ec-4558-9b24-eebd3bad3fde/how_to_descale_delonghi_magnifica_automatic_cappuccino.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/sat_1130_score.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/geziruketikajop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c2593e-c07f-4594-9ba9-d920d685c1b4/interior_design_courses_in_bangalore_yelahanka.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_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5300 bytes
SHA-256: aea798d58dc0718db6672a67b07281bee414f352d024836bbbf8dac04b93028c
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 10776 bytes
SHA-256: d835a3685d8eff70cd04d33919dd028ff09cd4341de93993a4c63408edc2296b

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