Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b331a3b4e1000fe…

MALICIOUS

PDF

48.1 KB Created: 2020-03-17 03:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 826763edace8469e6a5f0da35be6ef61 SHA-1: 000e994b6d7ac07bd9edcb7f63757e8ca2135488 SHA-256: 4b331a3b4e1000fe1fa0cc51b5d7bac69413e82925709a86ea03c5f6a23730c7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. The document body, though partially corrupted, contains a URL that is part of this link farm. This suggests a coordinated effort to generate traffic or engage in SEO manipulation, rather than a direct payload delivery. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ductcleaningdc.com/uploads/1/3/0/6/130639038/130639038.html#como+calcular+el+volumen+de+una+figura+conica PDF link annotation
    • http://100percentvoting.com/uploads/1/3/0/5/130589312/jizajoduvisorat.pdfIn PDF document text
    • http://www.optimalherbal.com/uploads/1/3/1/0/131070500/zalukivirinijal_jowimepage_bajufuzogonofek_sozoziloruxawa.pdfIn PDF document text
    • http://tabletsellingplus.com/uploads/1/3/0/4/130476978/maluzowuza.pdfIn PDF document text
    • http://reginainsulationpros.ca/uploads/1/3/0/8/130813957/tiwajepidowu-pevuvuzezufoxox-vinepiwekel-kevezopibalupe.pdfIn PDF document text
    • http://chaiyee.com/uploads/1/3/0/4/130477278/javazupi-balelexavopamo.pdfIn PDF document text
    • http://wileypcesymposium.com/uploads/1/3/0/6/130639972/mokupufopido_loton_jozokarenu_masijorune.pdfIn PDF document text
    • http://www.justinkennedymusic.com/uploads/1/3/0/6/130604091/ruvadudilokebufokum.pdfIn PDF document text
    • http://hfitonline.com/uploads/1/3/0/3/130313103/defonotadazo_kimofekotop.pdfIn PDF document text
    • http://jiahuilin.com/uploads/1/3/0/6/130605204/36c574b.pdfIn PDF document text
    • http://danaroberts.com/uploads/1/3/0/5/130588740/mumijejaf-baragevugegag-bofibagenezuvo.pdfIn PDF document text
    • http://webmail.entertain.hk/uploads/1/3/0/6/130640003/bapomese.pdfIn PDF document text
    • http://www.buckhillcoffee.com/uploads/1/3/0/2/130272619/7b153f8f77a527.pdfIn PDF document text
    • http://culturalrhetbymeg.com/uploads/1/3/0/7/130739478/molejexup.pdfIn PDF document text
    • http://theprocessonline.org/uploads/1/3/0/5/130589125/cc35bb4d5972761.pdfIn PDF document text
    • http://cometojamaicawedding.com/uploads/1/3/0/8/130815140/vopikijutulefu_defawavekonak.pdfIn PDF document text
    • http://elebtc.net/uploads/1/3/0/2/130272364/5006268.pdfIn PDF document text
    • http://mail.thefixstgeorge.com/uploads/1/3/0/3/130379381/cc1774ada3155.pdfIn PDF document text
    • http://www.hab214.com/uploads/1/3/0/7/130776211/4f986c609fc.pdfIn PDF document text
    • http://mymokshayoga.com/uploads/1/3/0/8/130813557/e3688.pdfIn PDF document text
    • http://redriverministries.org/uploads/1/3/0/3/130379158/968047.pdfIn PDF document text
    • http://chaletgirl.net/uploads/1/3/0/5/130544468/vodetekizi-vabax-majexiwukev.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 7720 bytes
SHA-256: 043a68594eecc6f117262ade564a34b6e82db0bb16a34b9af73e7b69fc59788b
font_01_sfnt_off00009237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9237 2788 bytes
SHA-256: 985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6
font_02_sfnt_off00009c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C05 16256 bytes
SHA-256: 2ff558907b3d2079d592cf45cb2533fb365004e24ebee175c1259f2a7a424ef5

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