Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b6ebfbd9958e28…

MALICIOUS

PDF

57.9 KB Created: 2020-03-09 07:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: d8f8a5dcfe366ee6425f30ac7bd7bede SHA-1: 4a6f859f5883a4f63c9cf52a195a86174fdfaaf7 SHA-256: c7b6ebfbd9958e282617222ad6582e0de0160902a7afb9d42866511ad2d753e7
124 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO spam tactic. The document body suggests a lure for downloading a PDF related to "Gst 101 use of english and communication skills". The presence of urgency and callback lures further supports a phishing or scam objective. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://haiyi-carriageinnsf.devsite-1.com/uploads/1/3/0/2/130288811/130288811.html#gst+101+use+of+english+and+communication+skills+pdf+download PDF link annotation
    • http://mail.matthewcampbelljewelry.com/uploads/1/3/0/7/130776808/xatuwa-gabebimuwo-tamevufobatova.pdfIn PDF document text
    • http://youngjoopark.net/uploads/1/3/0/4/130476045/078e2de2.pdfIn PDF document text
    • http://donerboyz.com/uploads/1/3/0/9/130969229/busedemizukilajeg.pdfIn PDF document text
    • http://marketingshingle.net/uploads/1/3/0/4/130436121/0d73973025.pdfIn PDF document text
    • http://pirtekkzn.com/uploads/1/3/0/4/130489230/6651535.pdfIn PDF document text
    • http://galileobrazil.com/uploads/1/3/0/9/130969343/db7df0ab1bb0d0.pdfIn PDF document text
    • http://homecomfortltd.com/uploads/1/3/0/3/130323285/rubopi-wusoturisar-vumuno.pdfIn PDF document text
    • http://supercoolertechnologies.com/uploads/1/3/0/4/130483413/4769222.pdfIn PDF document text
    • http://robinshome.org/uploads/1/3/0/9/130969432/6277d7940cba8a.pdfIn PDF document text
    • http://thefrc.us/uploads/1/3/0/7/130775221/nizulalalonenegoneji.pdfIn PDF document text
    • http://next-stepmentoring.com/uploads/1/3/0/7/130775462/gosumulegolagop.pdfIn PDF document text
    • http://bcollectiveboutique.com/uploads/1/3/0/3/130313755/tekerojifelewito.pdfIn PDF document text
    • http://phillipskruse.com/uploads/1/3/0/6/130639521/2934801.pdfIn PDF document text
    • http://74-123-76-126.mgwnet.com/uploads/1/3/0/6/130639811/ae706dff26875f.pdfIn PDF document text
    • http://markinthemiddle.org/uploads/1/3/0/4/130489023/1445326.pdfIn PDF document text
    • http://blairkhartman.com/uploads/1/3/0/7/130775130/joriwigobivawu_wokolepiv_karemef.pdfIn PDF document text
    • http://worldcultureguide.org/uploads/1/3/0/2/130272071/ragesowipujotu_vibezenel_palusuvikumag_gepatuvuf.pdfIn PDF document text
    • http://seattle2025.org/uploads/1/3/0/4/130479472/ad4d2.pdfIn PDF document text
    • http://m.transformationlifecoaching.net/uploads/1/3/0/6/130604458/lafilisemejilef.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9564 9076 bytes
SHA-256: c4b4c140dc873fc3acd2d7eed2cd7a65ff652af1af984448cefb5f8b366004f0
font_01_sfnt_off0000b7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 3132 bytes
SHA-256: 83212b3f6d1a8b966adce1b1a79854c8ee8cb7cace02cb1607409375bc7ca279
font_02_sfnt_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 16260 bytes
SHA-256: 46167556d27ce966593fb59d65f07bb05e314bf4f7fb947798e70db09fde1779