Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed4be31a280dfc3…

MALICIOUS

PDF

79.3 KB Created: 2021-04-14 01:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc38c3ff525686ffa2b5bbf0bcb6da1e SHA-1: ebe3f92c68f3f4e0e24ba90809c14f48274c7d92 SHA-256: 4ed4be31a280dfc3f7de8c325e5c22d7f0768b222163d0241f8904fa5ac89c6e
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to technical issues ('roku error code 003') which is a common lure for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+fix+roku+error+code+003 In PDF document text
    • http://golixudib.mypressonline.com/tupametuvefubegol.pdfIn PDF document text
    • https://cdn.sqhk.co/pajubopolak/1TSifgg/male_survivors_of_the_titanic.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/xolivumubozedof.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/rumabu_silori.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/HVgdhbD/nfl_scores_week_12019.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/4440020.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/bTiihhg/flying_bird_silhouette_identification.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/eynIhaP/impossible_level_mario_maker.pdfIn PDF document text
    • http://badgesverified.com/sony_dvd_bdp_s1200_manual8eepy.pdfIn PDF document text
    • https://cdn.sqhk.co/kulabokirow/dqrrthi/800_words_season_3_cast.pdfIn PDF document text
    • http://naturfresh.space/98577219825ux5hb.pdfIn PDF document text
    • http://8bitbeardsco.com/precalculus_with_limits_5th_edition3jvjd.pdfIn PDF document text
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/gulotifawed.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/56259144339.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_11df446d7c144f28a4bc6ba7b29151cd.pdf?index=trueIn PDF document text
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_2099d816fc8e421bb4ff50a848bb2112.pdf?index=trueIn PDF document text
    • http://girofili.myartsonline.com/kofajujafizudasawan.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/vikumifunoziwikufawuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/brew_install_older_terraform_version.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/30518463748.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 4860 bytes
SHA-256: 958cebed23ba75f7a46f33eaf0bad4787d3c060f3bc33a9914923229b383425a
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10756 bytes
SHA-256: ff78fe68a8026ee37218b77e5c8730311ed334da5cfb51e8bb5bb230cf881817
font_02_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3