Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4dde683c2629f7…

MALICIOUS

PDF

36.9 KB Created: 2020-05-17 01:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 644fd62dfa00cc54ef85830112a1bc64 SHA-1: 9086a347a4e3f47c9924d3b21764ed8313cb814d SHA-256: 3a4dde683c2629f71f88dcdf5941509ef0c450489c54d497647231eee1864ae2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs pointing to various PDF documents on different domains. This pattern is indicative of a link farm or a distribution mechanism for malicious content. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this intent. No scripts were extracted, and the document body is largely obfuscated, but the sheer volume of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://geevini.net/uploads/1/3/0/6/130604939/130604939.html#proses+metabolisme+karbohidrat+pdf PDF link annotation
    • http://allhallowscanine.com/uploads/1/3/1/0/131070723/5890704.pdfIn PDF document text
    • http://milegion-legacyrun.org/uploads/1/3/0/6/130621116/wudoguzidozejas.pdfIn PDF document text
    • http://1sttimebuyerdeposit.com/uploads/1/3/0/4/130475877/7912877.pdfIn PDF document text
    • http://tremainefoundation.net/uploads/1/3/0/3/130323212/xexinibum.pdfIn PDF document text
    • http://ryleeloucharity.com/uploads/1/3/0/8/130874422/tukolura.pdfIn PDF document text
    • http://junli2483.com/uploads/1/3/1/4/131408159/fobonololumupe_tulidimegip_momuzunigakux_padowa.pdfIn PDF document text
    • http://timsmythephotography.com/uploads/1/3/0/7/130739480/duxode.pdfIn PDF document text
    • http://dreamsandhelp.com/uploads/1/3/1/8/131856108/c865f9574f.pdfIn PDF document text
    • http://lovelyuntamedrituals.com/uploads/1/3/0/4/130489371/3548577.pdfIn PDF document text
    • http://avoiceforthelost.com/uploads/1/3/0/8/130874615/4851694.pdfIn PDF document text
    • http://ourvotenow.org/uploads/1/3/0/9/130969865/pebipilip_medoguvo_nuravomukitum.pdfIn PDF document text
    • http://roxannesloan.com/uploads/1/3/0/6/130639641/5694408.pdfIn PDF document text
    • http://itsdadoll.shop/uploads/1/3/1/3/131384127/fae6375bff87.pdfIn PDF document text
    • http://gabbard-cornell.com/uploads/1/3/0/4/130488414/wivikezapelaj.pdfIn PDF document text
    • http://levelsoflove.org/uploads/1/3/0/2/130272415/lopikipitupomoduz.pdfIn PDF document text
    • http://pl-eshop.me/uploads/1/3/0/6/130604562/21628dff20.pdfIn PDF document text
    • http://fullyinvolvedleather.com/uploads/1/3/1/3/131383586/5497005.pdfIn PDF document text
    • http://bsquarellc.com/uploads/1/3/0/4/130435848/edb62d578.pdfIn PDF document text
    • http://roylaws.com/uploads/1/3/1/3/131380786/ginabozejuworakofonu.pdfIn PDF document text
    • http://ivybrookmppta.com/uploads/1/3/0/3/130323445/soxarawavasolij.pdfIn PDF document text
    • http://westcreekfinancial.com/uploads/1/3/0/5/130546000/4b506cf.pdfIn PDF document text
    • http://riort.be/uploads/1/3/0/6/130639709/kebugubovupuzej.pdfIn PDF document text
    • http://abetterrentalproperty.com/uploads/1/3/0/6/130620430/1998425.pdfIn PDF document text
    • http://cesun2018.org/uploads/1/3/0/3/130313307/9220934.pdfIn PDF document text
    • http://christ4sure.org/uploads/1/3/1/0/131070847/kipediso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6606 9780 bytes
SHA-256: 6dab92adb7948b3e75d06f0130c5efdf63d5e46f6e470fe609462843e6ee00e4

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