Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ebb885ea733a3e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-14 00:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 53b610c053a05b71ec5fc2ef0773fbe3 SHA-1: ee54d8d054ed774a0eaea6e82ca93817fdd6ce6e SHA-256: 77ebb885ea733a3ee1745fe0e1345a44d8dacbc98d31ba6415da4e440846c68e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme designed to lead users to malicious content. The document body, though heavily obfuscated, contains keywords related to educational worksheets, likely a lure to disguise the malicious intent.

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://nipisod.ru/123?utm_term=place+value+worksheets+thousands+hundreds+tens+ones PDF link annotation
    • https://puluduzi.weebly.com/uploads/1/3/1/4/131453343/5467336.pdfIn PDF document text
    • https://rojurunonujimos.weebly.com/uploads/1/3/5/3/135325454/85939994.pdfIn PDF document text
    • http://grafoanaliz.ru/garmin_405_chargergcyu7.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/22210732965.pdfIn PDF document text
    • http://ruszaimclub.ru/commercial_electric_tester_ms8903h_battery_replacementwm6e9.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/tubelofewud.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/abd975bb.pdfIn PDF document text
    • http://profer-opt.ru/singer_heavy_duty_44232b5pn.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/8383968.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/13288394075.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/forex_trading_using_volume_price_analysis_anna_coulling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/palmistry_marriage_lines.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_f019f5ece6124698a58706bc21fb9dae.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/vizio_2.0_sound_bar_sb2020n-h6_review.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_447df02d73cd4739817920fd8bda4a9e.pdf?index=trueIn PDF document text
    • http://sopexalibip.onlinewebshop.net/55930921974.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/antineoplastic_drugs_classification.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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 5244 bytes
SHA-256: c9df9c347dcb10e0c9340abe30a24e63204239916d262528a64a8bd510257dbe
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10496 bytes
SHA-256: 96725c8f711de05fe93b7f8150ef0b8601c0722a8c3431576fa2cb3319c51714

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