Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5588e1fb73a4b8…

MALICIOUS

PDF

59.6 KB Created: 2020-03-22 13:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 9cb27727066223bf2349bbac31eda945 SHA-1: c1eeebcafe238e3fb9c74f5df10f4b34b4515ae4 SHA-256: 4a5588e1fb73a4b846b2aa638bbb9473ae13604c48a265fc9273efdef8bf5a73
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to direct users to malicious content. The document body, though partially corrupted, suggests a lure related to 'Organigrama de automotriz chevrolet'. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted from this sample.

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://ambtcex.com/uploads/1/3/0/7/130776096/130776096.html#organigrama+de+automotriz+chevrolet PDF link annotation
    • http://www.highsocietysst.com/uploads/1/3/0/7/130775346/gefuju.pdfIn PDF document text
    • http://heatherempowers.com/uploads/1/3/0/4/130476624/kekuzida.pdfIn PDF document text
    • http://iodpmsolutions.com/uploads/1/3/0/4/130488935/pujixuf_luvad_jabebijotis.pdfIn PDF document text
    • http://ancestralconstellation.com/uploads/1/3/0/7/130775690/425752005d5dc.pdfIn PDF document text
    • http://thingsome.com/uploads/1/3/0/5/130551920/1605510.pdfIn PDF document text
    • http://dalelashsholisticsangha.com/uploads/1/3/0/6/130639404/8752456.pdfIn PDF document text
    • http://joyceandcraig.com/uploads/1/3/0/8/130813948/91b55b62c93a3.pdfIn PDF document text
    • http://emeraldgreenandwhite.com/uploads/1/3/1/0/131070325/fekifikufip_tojer_muzakexesakiwe.pdfIn PDF document text
    • http://2clearlycharming.com/uploads/1/3/0/5/130589195/vuvirajikabegigeton.pdfIn PDF document text
    • http://www.afterthegig.com/uploads/1/3/0/5/130588276/dd7697318.pdfIn PDF document text
    • http://myunique.me/uploads/1/3/0/5/130538990/xutetovepixizij.pdfIn PDF document text
    • http://fischertaketwo.com/uploads/1/3/0/5/130588513/xizopivatiteg.pdfIn PDF document text
    • http://hero-brands.com/uploads/1/3/0/6/130604815/1684021.pdfIn PDF document text
    • http://soundbeatstudio.net/uploads/1/3/0/5/130590435/2041702.pdfIn PDF document text
    • http://tso-ho.com/uploads/1/3/0/7/130738646/tasub-darujudadarisa-musajutoz-labebixifug.pdfIn PDF document text
    • http://nadiafarah.com/uploads/1/3/0/5/130588997/vigigurazog_fevilebewet_venupumipanaf.pdfIn PDF document text
    • http://kathleenomollo.info/uploads/1/3/0/5/130551335/7bd51029651d6de.pdfIn PDF document text
    • http://canyoudecide.org/uploads/1/3/0/8/130874540/0676de4a02.pdfIn PDF document text
    • http://kellypick.com/uploads/1/3/0/5/130539179/monipexevufede.pdfIn PDF document text
    • http://maries-crafts-by-laura.com/uploads/1/3/0/8/130874179/395f45.pdfIn PDF document text
    • http://netmagnetism.ca/uploads/1/3/0/7/130775167/1fec1.pdfIn PDF document text
    • http://proaccessinc.com/uploads/1/3/0/5/130539279/vipetuvi_zekuviwupa.pdfIn PDF document text
    • http://hostmaster.velobristol.co.uk/uploads/1/3/0/3/130323573/7768641.pdfIn PDF document text
    • http://taylorturf.com/uploads/1/3/0/6/130639081/nosafij.pdfIn PDF document text
    • http://www.zemingchen.com/uploads/1/3/0/6/130620614/f08b838d1c48.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D7 9400 bytes
SHA-256: f9d9c7d3613976619c49a00e769d09104b15eed778fa53d155cbbf8bfe2a0ea6
font_01_sfnt_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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