Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cce44b98ba088d…

MALICIOUS

PDF

77.7 KB Created: 2021-04-04 16:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eef57841c5249a81ea70d8ddb9cd00e3 SHA-1: 8f852bb7ef57b3ab4f054bc8e72458331d7d657a SHA-256: b7cce44b98ba088d3e5c8cb5c0945ba5ac06e4899fe1ea01b73e45c5485b65f2
156 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 0.9996

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=pltw+poe+final+exam+answer+key PDF link annotation
    • http://tameenegypt.com/debexedapuvobutepiou3ql.pdfIn PDF document text
    • http://myfavoritesun.xyz/mozesigovoxonuif12x.pdfIn PDF document text
    • http://keepxufi.space/is_silence_of_the_lambs_on_netflix_india42bke.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/bojakafeligawegikono.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/99314796229pcy3b.pdfIn PDF document text
    • http://businessoutsourcing.info/4588425570sdp15.pdfIn PDF document text
    • http://evakuator-uga.ru/beminiduvukilosoluredowtatwu.pdfIn PDF document text
    • http://autolombardpro.ru/charade_full_movieudqwd.pdfIn PDF document text
    • http://opsnatur.fun/metro_rail_map_los_angelesa6b41.pdfIn PDF document text
    • http://blekrossi.ru/how_to_apply_cricut_stickerg0vc1.pdfIn PDF document text
    • http://hugertely.xyz/lomixagapkjrg9.pdfIn PDF document text
    • http://conicppjry.bid/how_to_heal_acl_surgery_fast5jb3v.pdfIn PDF document text
    • http://muldwych.com/duwiwipokixa3xf5k.pdfIn PDF document text
    • http://topuniversityru.fun/691545300289w6sa.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/karawilika_suxezexot.pdfIn PDF document text
    • http://leree6.club/rekekamorupancp9nb.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/limepusotanal/44820361878.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/2019_telugu_movies_in_jio_rockers.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/93057203066.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/nofasu.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/thermal_energy_transformation_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/anjaan_tamil_songs_2014.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_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 5372 bytes
SHA-256: 188f663d29d96a866b6dfd8bb9ae50245de4699f4d0b1dee9fe2f8c227a1ec26
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 10948 bytes
SHA-256: 89ea0f0138718aa54fdeb0a2cbd54cba96243178c2e89b931d5418753adc86b9

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