Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6451df04e9b58bd…

MALICIOUS

PDF

67.8 KB Created: 2021-02-20 15:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8735fe156391381c1a0ae102d22ce325 SHA-1: cc9824917ea4585b9729039ed077b11910f759d1 SHA-256: f6451df04e9b58bdbb17625b04c4a53ed47487a2b1ba6acc9ceae38ead80e22f
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, identified as malicious. The document's content, though partially corrupted, suggests a lure related to 'information technology jobs houston entry level'. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is a strong indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://crophysi.ru/wb?keyword=information%20technology%20jobs%20houston%20entry%20level In PDF document text
    • https://cdn.sqhk.co/bijowiroma/GWiejdq/65593832311.pdfIn PDF document text
    • http://ketousa.site/rawopufopopekewispk20j.pdfIn PDF document text
    • https://cdn.sqhk.co/loxosefivipo/bjijjNr/domino_tie_breaker.pdfIn PDF document text
    • http://lupepujalin.iblogger.org/adobe_flash_player_for_chrome_free.pdfIn PDF document text
    • https://mugakosi.weebly.com/uploads/1/3/1/3/131379948/jokaxa.pdfIn PDF document text
    • http://com-servers.online/how_many_moles_in_h2orlxyz.pdfIn PDF document text
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/wukeb.pdfIn PDF document text
    • http://demask.fun/kagirelafiwulijenivujo4xsgz.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/cwVfM2u/forest_green_bubble_jacket.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://s3.amazonaws.com/paxivogedewilu/17567161213.pdfIn PDF document text
    • http://xazasanedaned.epizy.com/86929158432.pdfIn PDF document text
    • http://weweladegop.rf.gd/lajiwuteterudemumoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/xamarin_forms_binding_converterparameter.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/waluremenur.pdfIn PDF document text
    • http://pijularof.epizy.com/glossary_of_computer_science_terms.pdfIn PDF document text
    • http://jikafazasakojob.epizy.com/ata_thyroid_pregnancy_guidelines_2017.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/31901992796.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_off0000c048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 5492 bytes
SHA-256: 049bed1b7e084a7df5a46f8a74dd1162000fdcae0a3e646ec42c256ec41fab40
font_01_sfnt_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 9528 bytes
SHA-256: e14df4790d1e929b4150a744514c14ce44ce5a0aab8c51f69ba08628ed9661aa
font_02_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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