Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acc603fe74e1d3b…

MALICIOUS

PDF

74.2 KB Created: 2021-01-25 16:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0e087ecb9dd66788c22750502ff37300 SHA-1: 82360ae57746520dfe50fac7e161daf4feefc952 SHA-256: 6acc603fe74e1d3b116127c0f48539218f933dff1ac93a7e829ff885dc941404
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains fragments related to 'Asure id express manual', suggesting a potential lure for credential harvesting or phishing.

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://yafferge.ru/aws?utm_term=asure+id+express+manual In PDF document text
    • http://italy50wow.pro/urine_neutralizer_sprayurf2e.pdfIn PDF document text
    • http://lasleymarkt.ru/51175405944o5ggj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_600dc5876d16f.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/tovisuvab7g333.pdfIn PDF document text
    • http://vuwavutos.iblogger.org/89909503642.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/a652229.pdfIn PDF document text
    • http://peskomment.ru/xanuviwokifekefoxuxile3iex4.pdfIn PDF document text
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/1366551.pdfIn PDF document text
    • http://bonboxstudio.com/1981989041swnaf.pdfIn PDF document text
    • http://koteyarn.moscow/imagens_da_masha_e_o_urso_para_pintar7o0bx.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/785253.pdfIn PDF document text
    • http://sodiwemewobigi.22web.org/cat_wala_game_karna_hai.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/rafogigove_vobijasiv_nagok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daduzafez.epizy.com/break_even_analysis_example.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 5164 bytes
SHA-256: 15aa5b3da8cc9892c7ab72605630cf02ada86a018dadd5ffb9fcdbff51e0a99e
font_01_sfnt_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 14388 bytes
SHA-256: cc2926a8085cda0f5de780133510c9ffceb93800d97cf54444d5c223b83122c3
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

Open this report in the interactive analyzer, or submit your own file for analysis.